fix(deps): update dependency dev.zacsweers.kctfork:core to v0.7.1 (#1945)

This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
|
[dev.zacsweers.kctfork:core](https://redirect.github.com/zacsweers/kotlin-compile-testing)
| `0.7.0` -> `0.7.1` |
[![age](https://developer.mend.io/api/mc/badges/age/maven/dev.zacsweers.kctfork:core/0.7.1?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/maven/dev.zacsweers.kctfork:core/0.7.1?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/maven/dev.zacsweers.kctfork:core/0.7.0/0.7.1?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/maven/dev.zacsweers.kctfork:core/0.7.0/0.7.1?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>

###
[`v0.7.1`](https://redirect.github.com/zacsweers/kotlin-compile-testing/blob/HEAD/CHANGELOG.md#071)

[Compare
Source](https://redirect.github.com/zacsweers/kotlin-compile-testing/compare/0.7.0...0.7.1)

*2025-05-05*

- Remove references to `useOldBackend`, which is removed in Kotlin
`2.2.0`.

</details>

---

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github-workflows-kt/build.gradle.kts

@@ -27,7 +27,7 @@ dependencies {
     implementation(projects.sharedInternal)
     ksp(projects.codeGenerator)
 
-    testImplementation("dev.zacsweers.kctfork:core:0.7.0")
+    testImplementation("dev.zacsweers.kctfork:core:0.7.1")
     // Needed to use the right version of the compiler for the libraries that depend on it.
     testImplementation(kotlin("compiler"))
     testImplementation(kotlin("reflect"))