cicd: updated action versions

Author: sttk

.github/workflows/java-ci.yml

@@ -14,7 +14,7 @@ jobs:
         javaver: [21, 22, 23, 24]
         os: [ubuntu-latest, windows-latest, macos-latest]
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v6
     - name: GitHub Action for GraalVM
       uses: graalvm/setup-graalvm@v1
       with: