build(deps): bump actions/setup-java from 4.9.1 to 6.0.1

Bumps [actions/setup-java](https://github.com/actions/setup-java) from 4.9.1 to 6.0.1.
- [Release notes](https://github.com/actions/setup-java/releases)
- [Commits](https://github.com/actions/setup-java/compare/cf277c60eb25467037889841efdb72551f06f6c3...de7274f081f381c8f8158605e0321c36c376e2e6)

---
updated-dependencies:
- dependency-name: actions/setup-java
  dependency-version: 6.0.1
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

.github/workflows/ci.yml

@@ -206,7 +206,7 @@ jobs:
       # compiled by bootstrap on a live host, and the test mains under plugins/*/test
       # were run by hand. JDK 25 is what the plugin build image runs (paper-api 26.x
       # needs it); each module's wrapper brings the Gradle the image pins.
-      - uses: actions/setup-java@cf277c60eb25467037889841efdb72551f06f6c3 # v4.9.1
+      - uses: actions/setup-java@de7274f081f381c8f8158605e0321c36c376e2e6 # v6.0.1
         with:
           distribution: temurin
           java-version: '25'
@@ -225,7 +225,7 @@ jobs:
       # this job nothing ever built them: no install path touches them, and their
       # gradlew scripts were committed without the exec bit, so the README's
       # one-liners failed on a fresh clone.
-      - uses: actions/setup-java@cf277c60eb25467037889841efdb72551f06f6c3 # v4.9.1
+      - uses: actions/setup-java@de7274f081f381c8f8158605e0321c36c376e2e6 # v6.0.1
         with:
           distribution: temurin
           java-version: '17'