Update moshix to v0.26.0 (#847)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [dev.zacsweers.moshix](https://togithub.com/ZacSweers/MoshiX) | plugin
| minor | `0.25.1` -> `0.26.0` |
|
[dev.zacsweers.moshix:moshi-gradle-plugin](https://togithub.com/ZacSweers/MoshiX)
| dependencies | minor | `0.25.1` -> `0.26.0` |

---

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

---

### Release Notes

<details>
<summary>ZacSweers/MoshiX (dev.zacsweers.moshix)</summary>

###
[`v0.26.0`](https://togithub.com/ZacSweers/MoshiX/blob/HEAD/CHANGELOG.md#0260)

[Compare
Source](https://togithub.com/ZacSweers/MoshiX/compare/0.25.1...0.26.0)

*2024-05-12*

##### **New**: Publish a new `moshi-immutable-adapters` artifact with
support for
[kotlinx.collections.immutable](https://togithub.com/Kotlin/kotlinx.collections.immutable).

Gradle dependency

```kotlin
dependencies {
  implementation("dev.zacsweers.moshix:moshi-immutable-adapters:<version>")
}
```

In code

```kotlin
val moshi = Moshi.Builder().add(ImmutableCollectionsJsonAdapterFactory()).build()
```

**Supported types**

-   `ImmutableCollection`
-   `ImmutableList`
-   `ImmutableSet`
-   `ImmutableMap`
-   `PersistentCollection`
-   `PersistentList`
-   `PersistentSet`
-   `PersistentMap`

##### Misc

- Omit the stdlib from transitive dependencies on the compiler plugin
and Gradle plugin artifacts. Both kotlinc and Gradle impose their own
versions on the classpath.
-   Update Moshi to `1.15.1`.
-   Update kotlinx-metadata to `0.9.0`.
-   Update KotlinPoet to `1.16.0`.
-   Update Kotlin to `1.9.24`.
-   Update KSP to `1.9.24-1.0.20`.
-   Update Guava to `33.2.0-jre`.
-   Compile against Gradle `8.7`.

</details>

---

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---

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gradle/libs.versions.toml

@@ -23,7 +23,7 @@ ktfmt = "0.49"
 markdown = "0.16.0"
 mavenPublish = "0.28.0"
 moshi = "1.15.1"
-moshix = "0.25.1"
+moshix = "0.26.0"
 nullawayGradle = "1.3.0"
 okhttp = "5.0.0-alpha.12"
 okio = "3.9.0"