Bump actions/setup-java from 5 to 6

Bumps [actions/setup-java](https://github.com/actions/setup-java) from 5 to 6.
- [Release notes](https://github.com/actions/setup-java/releases)
- [Commits](https://github.com/actions/setup-java/compare/v5...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>

.github/workflows/maven.yml

diff --git a/.github/workflows/maven.yml b/.github/workflows/maven.yml
index ace23cc..e6b586d 100644
--- a/.github/workflows/maven.yml
+++ b/.github/workflows/maven.yml
@@ -72,12 +72,12 @@
         esac
     - name: Set up toolchain JDK ${{ matrix.java }}
       id: setup-java-toolchain
-      uses: actions/setup-java@v5
+      uses: actions/setup-java@v6
       with:
         distribution: 'temurin'
         java-version: ${{ matrix.java }}
     - name: Set up JDK 17 for Maven
-      uses: actions/setup-java@v5
+      uses: actions/setup-java@v6
       with:
         distribution: 'temurin'
         java-version: '17'