ktlint broken in 8.4.0 — FeatureClassLoader missing Kotlin stdlib

## Bug

After upgrading from 8.3.0 to 8.4.0, `spotlessKotlinCheck` fails for all Kotlin files. ktlint cannot initialize because Spotless' `FeatureClassLoader` fails to load a core Kotlin stdlib class.

Root cause from the lint output:

```
Caused by: java.lang.ClassNotFoundException: kotlin.collections.ArraysKt___ArraysJvmKt
at com.diffplug.spotless.FeatureClassLoader.findClass(FeatureClassLoader.java:79)
...
at com.diffplug.spotless.glue.ktlint.compat.KtLintCompat1Dot0Dot0Adapter.(KtLintCompat1Dot0Dot0Adapter.java:68)
```

This happens both with `ktlint("1.8.0")` and `ktlint()` (default). Reverting to 8.3.0 fixes it.

## Environment

- Spotless: 8.4.0 (8.3.0 works)
- Kotlin: 2.3.20
- Gradle: 9.4.1
- JDK: 21

## Notes

The 8.4.0 changelog shows no ktlint changes. The predeclared dependencies fix might have affected how ktlint's classpath is assembled in `FeatureClassLoader`.