fix(deps): update dependency dev.zacsweers.kctfork:core to v0.9.0 (#2080)

This PR contains the following updates:

| Package | Change | Age | Confidence |
|---|---|---|---|
|
[dev.zacsweers.kctfork:core](https://redirect.github.com/zacsweers/kotlin-compile-testing)
| `0.8.0` -> `0.9.0` |
[![age](https://developer.mend.io/api/mc/badges/age/maven/dev.zacsweers.kctfork:core/0.9.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/maven/dev.zacsweers.kctfork:core/0.8.0/0.9.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

---

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---

### Release Notes

<details>
<summary>zacsweers/kotlin-compile-testing
(dev.zacsweers.kctfork:core)</summary>

###
[`v0.9.0`](https://redirect.github.com/zacsweers/kotlin-compile-testing/blob/HEAD/CHANGELOG.md#090)

[Compare
Source](https://redirect.github.com/zacsweers/kotlin-compile-testing/compare/0.8.0...0.9.0)

*2025-09-11*

- Update to Kotlin `2.2.20`. This release requires `2.2.20` or later.
- Build against KSP `2.2.20-2.0.2`.

</details>

---

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github-workflows-kt/build.gradle.kts

@@ -29,7 +29,7 @@ dependencies {
     implementation(projects.sharedInternal)
     ksp(projects.codeGenerator)
 
-    testImplementation("dev.zacsweers.kctfork:core:0.8.0")
+    testImplementation("dev.zacsweers.kctfork:core:0.9.0")
     // Needed to use the right version of the compiler for the libraries that depend on it.
     testImplementation(kotlin("compiler"))
     testImplementation(kotlin("reflect"))