[ci] Bump actions/cache from 5 to 6

Bumps [actions/cache](https://github.com/actions/cache) from 5 to 6.
- [Release notes](https://github.com/actions/cache/releases)
- [Changelog](https://github.com/actions/cache/blob/main/RELEASES.md)
- [Commits](actions/cache@v5...v6)

---
updated-dependencies:
- dependency-name: actions/cache
  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/cross-maven.yml

@@ -70,7 +70,7 @@ jobs:
           distribution: 'temurin'
           java-version: 21
       - name: Cache Maven packages
-        uses: actions/cache@v5
+        uses: actions/cache@v6
         with:
           path: ~/.m2
           key: ${{ runner.os }}-m2-${{ hashFiles('**/pom.xml') }}

.github/workflows/maven.yml

@@ -37,7 +37,7 @@ jobs:
           distribution: 'temurin'
           java-version: 21
       - name: Cache Maven packages
-        uses: actions/cache@v5
+        uses: actions/cache@v6
         with:
           path: ~/.m2
           key: ${{ runner.os }}-m2-${{ hashFiles('**/pom.xml') }}

.github/workflows/release.yml

@@ -38,7 +38,7 @@ jobs:
           cache: 'maven'
 
       - name: Cache Maven packages
-        uses: actions/cache@v5
+        uses: actions/cache@v6
         with:
           path: ~/.m2
           key: ${{ runner.os }}-m2-release-${{ github.sha }}