Update test output to include check_contracts cfg

This is now a valid expected value.

tests/ui/check-cfg/cargo-build-script.stderr

@@ -4,7 +4,7 @@ warning: unexpected `cfg` condition name: `has_foo`
 LL | #[cfg(has_foo)]
    |       ^^^^^^^
    |
-   = help: expected names are: `has_bar` and 30 more
+   = help: expected names are: `has_bar` and 31 more
    = help: consider using a Cargo feature instead
    = help: or consider adding in `Cargo.toml` the `check-cfg` lint config for the lint:
             [lints.rust]

tests/ui/check-cfg/cargo-feature.none.stderr

@@ -25,7 +25,7 @@ warning: unexpected `cfg` condition name: `tokio_unstable`
 LL | #[cfg(tokio_unstable)]
    |       ^^^^^^^^^^^^^^
    |
-   = help: expected names are: `docsrs`, `feature`, and `test` and 30 more
+   = help: expected names are: `docsrs`, `feature`, and `test` and 31 more
    = help: consider using a Cargo feature instead
    = help: or consider adding in `Cargo.toml` the `check-cfg` lint config for the lint:
             [lints.rust]

tests/ui/check-cfg/cargo-feature.some.stderr

@@ -25,7 +25,7 @@ warning: unexpected `cfg` condition name: `tokio_unstable`
 LL | #[cfg(tokio_unstable)]
    |       ^^^^^^^^^^^^^^
    |
-   = help: expected names are: `CONFIG_NVME`, `docsrs`, `feature`, and `test` and 30 more
+   = help: expected names are: `CONFIG_NVME`, `docsrs`, `feature`, and `test` and 31 more
    = help: consider using a Cargo feature instead
    = help: or consider adding in `Cargo.toml` the `check-cfg` lint config for the lint:
             [lints.rust]

tests/ui/check-cfg/cfg-value-for-cfg-name-duplicate.stderr

@@ -4,7 +4,7 @@ warning: unexpected `cfg` condition name: `value`
 LL | #[cfg(value)]
    |       ^^^^^
    |
-   = help: expected names are: `bar`, `bee`, `cow`, and `foo` and 30 more
+   = help: expected names are: `bar`, `bee`, `cow`, and `foo` and 31 more
    = help: to expect this configuration use `--check-cfg=cfg(value)`
    = note: see <https://doc.rust-lang.org/nightly/rustc/check-cfg.html> for more information about checking conditional configuration
    = note: `#[warn(unexpected_cfgs)]` on by default

tests/ui/check-cfg/cfg-value-for-cfg-name-multiple.stderr

@@ -4,7 +4,7 @@ warning: unexpected `cfg` condition name: `my_value`
 LL | #[cfg(my_value)]
    |       ^^^^^^^^
    |
-   = help: expected names are: `bar` and `foo` and 30 more
+   = help: expected names are: `bar` and `foo` and 31 more
    = help: to expect this configuration use `--check-cfg=cfg(my_value)`
    = note: see <https://doc.rust-lang.org/nightly/rustc/check-cfg.html> for more information about checking conditional configuration
    = note: `#[warn(unexpected_cfgs)]` on by default

tests/ui/check-cfg/exhaustive-names-values.feature.stderr

@@ -4,7 +4,7 @@ warning: unexpected `cfg` condition name: `unknown_key`
 LL | #[cfg(unknown_key = "value")]
    |       ^^^^^^^^^^^^^^^^^^^^^
    |
-   = help: expected names are: `feature` and 30 more
+   = help: expected names are: `feature` and 31 more
    = help: to expect this configuration use `--check-cfg=cfg(unknown_key, values("value"))`
    = note: see <https://doc.rust-lang.org/nightly/rustc/check-cfg.html> for more information about checking conditional configuration
    = note: `#[warn(unexpected_cfgs)]` on by default

tests/ui/check-cfg/exhaustive-names-values.full.stderr

@@ -4,7 +4,7 @@ warning: unexpected `cfg` condition name: `unknown_key`
 LL | #[cfg(unknown_key = "value")]
    |       ^^^^^^^^^^^^^^^^^^^^^
    |
-   = help: expected names are: `feature` and 30 more
+   = help: expected names are: `feature` and 31 more
    = help: to expect this configuration use `--check-cfg=cfg(unknown_key, values("value"))`
    = note: see <https://doc.rust-lang.org/nightly/rustc/check-cfg.html> for more information about checking conditional configuration
    = note: `#[warn(unexpected_cfgs)]` on by default

tests/ui/check-cfg/mix.stderr

@@ -44,7 +44,7 @@ warning: unexpected `cfg` condition name: `uu`
 LL | #[cfg_attr(uu, unix)]
    |            ^^
    |
-   = help: expected names are: `feature` and 30 more
+   = help: expected names are: `feature` and 31 more
    = help: to expect this configuration use `--check-cfg=cfg(uu)`
    = note: see <https://doc.rust-lang.org/nightly/rustc/check-cfg.html> for more information about checking conditional configuration
 

tests/ui/check-cfg/raw-keywords.edition2015.stderr

@@ -14,7 +14,7 @@ warning: unexpected `cfg` condition name: `r#false`
 LL | #[cfg(r#false)]
    |       ^^^^^^^
    |
-   = help: expected names are: `async`, `edition2015`, `edition2021`, and `r#true` and 30 more
+   = help: expected names are: `async`, `edition2015`, `edition2021`, and `r#true` and 31 more
    = help: to expect this configuration use `--check-cfg=cfg(r#false)`
    = note: see <https://doc.rust-lang.org/nightly/rustc/check-cfg.html> for more information about checking conditional configuration
 

tests/ui/check-cfg/raw-keywords.edition2021.stderr

@@ -14,7 +14,7 @@ warning: unexpected `cfg` condition name: `r#false`
 LL | #[cfg(r#false)]
    |       ^^^^^^^
    |
-   = help: expected names are: `r#async`, `edition2015`, `edition2021`, and `r#true` and 30 more
+   = help: expected names are: `r#async`, `edition2015`, `edition2021`, and `r#true` and 31 more
    = help: to expect this configuration use `--check-cfg=cfg(r#false)`
    = note: see <https://doc.rust-lang.org/nightly/rustc/check-cfg.html> for more information about checking conditional configuration
 

tests/ui/check-cfg/report-in-external-macros.cargo.stderr

@@ -4,7 +4,7 @@ warning: unexpected `cfg` condition name: `my_lib_cfg`
 LL |     cfg_macro::my_lib_macro!();
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
-   = help: expected names are: `feature` and 30 more
+   = help: expected names are: `feature` and 31 more
    = note: using a cfg inside a macro will use the cfgs from the destination crate and not the ones from the defining crate
    = help: try referring to `cfg_macro::my_lib_macro` crate for guidance on how handle this unexpected cfg
    = help: the macro `cfg_macro::my_lib_macro` may come from an old version of the `cfg_macro` crate, try updating your dependency with `cargo update -p cfg_macro`

tests/ui/check-cfg/report-in-external-macros.rustc.stderr

@@ -4,7 +4,7 @@ warning: unexpected `cfg` condition name: `my_lib_cfg`
 LL |     cfg_macro::my_lib_macro!();
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
-   = help: expected names are: `feature` and 30 more
+   = help: expected names are: `feature` and 31 more
    = note: using a cfg inside a macro will use the cfgs from the destination crate and not the ones from the defining crate
    = help: try referring to `cfg_macro::my_lib_macro` crate for guidance on how handle this unexpected cfg
    = help: to expect this configuration use `--check-cfg=cfg(my_lib_cfg)`

tests/ui/check-cfg/well-known-names.stderr

@@ -5,6 +5,7 @@ LL | #[cfg(list_all_well_known_cfgs)]
    |       ^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: expected names are: `clippy`
+`contract_checks`
 `debug_assertions`
 `doc`
 `doctest`