Point annotate-snippets to upstream commit

Summary:
PR was merged: rust-lang/annotate-snippets-rs#54

Easier to keep track of by pointing to an upstream rev rather than a
fork.

Reviewed By: ndmitchell, shayne-fletcher

Differential Revision: D50743702

fbshipit-source-id: f9a58c4901f85e0b489e5785a8137e2ffc477884

Cargo.toml

@@ -1,6 +1,6 @@
 [patch.crates-io]
 abomonation = { git = "https://github.com/markbt/abomonation", rev = "0f43346d2afa2aedc64d61f3f4273e8d1e454642" }
-annotate-snippets = { git = "https://github.com/rust-lang/annotate-snippets-rs.git", rev = "ee4687bf8d668f8cb6b76e5a518de7016a5ef7bd" }
+annotate-snippets = { git = "https://github.com/rust-lang/annotate-snippets-rs.git", rev = "160ef451acded1f92e7ddc462f9e1d8a3f99dcce" }
 base64urlsafedata = { git = "https://github.com/kanidm/webauthn-rs.git", rev = "d4b418487ff7726464549b43bf850509694c3e74" }
 curve25519-dalek = { git = "https://github.com/hariria/curve25519-dalek", rev = "1f39e7b369dc70f432370c9703229a45bfa9664e" }
 dachshund = { git = "https://github.com/facebookresearch/dachshund", rev = "ec4cc35bc5afb0db5f791ee9e3168e7586986c88" }