fix: update the workflow to Node 20 actions because Node 16 reached end of life

https://github.com/osscameroon/js-generator/actions/runs/8132746116?pr=264

https://github.blog/changelog/2023-09-22-github-actions-transitioning-from-node-16-to-node-20/

actions/setup-java#533

https://stackoverflow.com/questions/77897660/node-js-16-actions-are-deprecated-please-update-the-following-actions-to-use-no

Author: FanJups

.github/workflows/maven.yml

@@ -16,9 +16,9 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: Set up JDK 17
-      uses: actions/setup-java@v3
+      uses: actions/setup-java@v4
       with:
         distribution: 'temurin'
         java-version: 17