Update GitHub build actions to fix warnings (Node 12 deprecated)

Author: rogermb

.github/workflows/maven.yml

@@ -12,9 +12,9 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - name: Set up JDK 8
-        uses: actions/setup-java@v2
+        uses: actions/setup-java@v3
         with:
           java-version: '8'
           distribution: 'zulu'
@@ -30,9 +30,9 @@ jobs:
     if: ${{ github.event_name == 'push' && github.ref == 'refs/heads/master' }}
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - name: Set up JDK 8
-        uses: actions/setup-java@v2
+        uses: actions/setup-java@v3
         with:
           java-version: '8'
           distribution: 'zulu'