Update anvil to v0.3.0 (#1614)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [dev.zacsweers.anvil](https://redirect.github.com/zacsweers/anvil) |
plugin | minor | `0.2.6` -> `0.3.0` |
|
[dev.zacsweers.anvil:annotations-optional](https://redirect.github.com/zacsweers/anvil)
| dependencies | minor | `0.2.6` -> `0.3.0` |
|
[dev.zacsweers.anvil:annotations](https://redirect.github.com/zacsweers/anvil)
| dependencies | minor | `0.2.6` -> `0.3.0` |

---

> [!WARNING]
> Some dependencies could not be looked up. Check the Dependency
Dashboard for more information.

---

### Release Notes

<details>
<summary>zacsweers/anvil (dev.zacsweers.anvil)</summary>

###
[`v0.3.0`](https://redirect.github.com/zacsweers/anvil/blob/HEAD/CHANGELOG.md#030)

[Compare
Source](https://redirect.github.com/zacsweers/anvil/compare/0.2.6...0.3.0)

*2024-08-31*

- **New**: Add option to disable contributes subcomponent handling. This
can be useful if working in a codebase or project that doesn't use
`@ContributeSubcomponent` and thus doesn't need to scan the classpath
for them while merging. More details can be found in the `## Options`
section of `FORK.md`.
- **Enhancement**: Improve hint caching during contribution merging.
Hints from the classpath are now only searched for once rather than
every round.
-   **Enhancement**: Improve error messaging when class lookups fail.
- **Fix**: Don't use `ClassName.toString()` for `KSClassDeclaration`
lookups.
- **Fix**: Ensure round processing is correctly reset if no
`@ContributeSubcomponent` triggers are found in a given round. This was
an edge case that affected projects with custom code generators that
generated triggers in a later round.

</details>

---

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rebase/retry checkbox.

🔕 **Ignore**: Close this PR and you won't be reminded about these
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---

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---

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gradle/libs.versions.toml

@@ -6,7 +6,7 @@ androidx-appcompat = "1.7.0"
 androidx-browser = "1.8.0"
 androidx-lifecycle = "2.8.4"
 agp = "8.5.2"
-anvil = "0.2.6"
+anvil = "0.3.0"
 atomicfu = "0.25.0"
 benchmark = "1.3.0"
 coil = "2.7.0"