Bump actions/setup-java from 4 to 6

Bumps [actions/setup-java](https://github.com/actions/setup-java) from 4 to 6.
- [Release notes](https://github.com/actions/setup-java/releases)
- [Commits](actions/setup-java@v4...v6)

---
updated-dependencies:
- dependency-name: actions/setup-java
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/build.yml

@@ -11,7 +11,7 @@ jobs:
         submodules: recursive
         fetch-depth: 0 # needed for versioning
     - name: Set up Java
-      uses: actions/setup-java@v4
+      uses: actions/setup-java@v6
       with:
         distribution: 'temurin'
         java-version: 25

.github/workflows/publish.yml

@@ -15,7 +15,7 @@ jobs:
         submodules: recursive
         fetch-depth: 0 # needed for versioning
     - name: Set up Java
-      uses: actions/setup-java@v4
+      uses: actions/setup-java@v6
       with:
         distribution: 'temurin'
         java-version: 25