Update GitHub action versions

-   https://github.com/actions/checkout
-   https://github.com/actions/setup-java

Author: stanio

.github/workflows/maven.yml

@@ -20,9 +20,9 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: Set up JDK 21
-      uses: actions/setup-java@v3
+      uses: actions/setup-java@v4
       with:
         java-version: '21'
         distribution: 'temurin'