update: GitHub Actions to latest versions

Author: UnschooledGamer

.github/workflows/nightly-build.yml

@@ -95,24 +95,25 @@
             echo "should not skip tags, releases: ${{ ! inputs.skip_tagging_and_releases }}" >> $GITHUB_STEP_SUMMARY     
 
         - name: Checkout Repository
-          uses: actions/checkout@v4
+          uses: actions/checkout@v6
           with:
             fetch-depth: 0 # Required for tags
             # persists credentials locally if tagging and releases are not skipped.
             persist-credentials: ${{ ! inputs.skip_tagging_and_releases }}
             ref: ${{ (inputs.is_PR && inputs.PR_NUMBER) && github.event.pull_request.head.sha || '' }}
 
         - name: Set up Java 21
-          uses: actions/setup-java@v4
+          uses: actions/setup-java@v5
           with:
             distribution: 'temurin'
             java-version: '21'
             cache: ${{ (!(inputs.is_PR && inputs.PR_NUMBER) && github.ref == 'refs/heads/main' && 'gradle') || '' }}
 
         - name: Set up Node.js
-          uses: actions/setup-node@v4
+          uses: actions/setup-node@v6
           with:
             node-version: 'lts/*' # or '18.x' for latest stable
+            cache: ${{ (!(inputs.is_PR && inputs.PR_NUMBER) && github.ref == 'refs/heads/main' && 'npm') || '' }}
 
         - name: Add keystore and build.json from secrets
           run: |