Update anvil to v0.3.1 (#1615)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [dev.zacsweers.anvil](https://redirect.github.com/zacsweers/anvil) |
plugin | patch | `0.3.0` -> `0.3.1` |
|
[dev.zacsweers.anvil:annotations-optional](https://redirect.github.com/zacsweers/anvil)
| dependencies | patch | `0.3.0` -> `0.3.1` |
|
[dev.zacsweers.anvil:annotations](https://redirect.github.com/zacsweers/anvil)
| dependencies | patch | `0.3.0` -> `0.3.1` |

---

> [!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>

###
[`v0.3.1`](https://redirect.github.com/zacsweers/anvil/blob/HEAD/CHANGELOG.md#031)

[Compare
Source](https://redirect.github.com/zacsweers/anvil/compare/0.3.0...0.3.1)

*2024-09-02*

- **Enhancement**: Better handle error types and round deferral for
generated types.

</details>

---

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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 = "0.3.0"
+anvil = "0.3.1"
 atomicfu = "0.25.0"
 benchmark = "1.3.0"
 coil = "2.7.0"