Maven build workflow: set up maven

Author: swa-ds

.github/workflows/maven-build.yml

@@ -28,5 +28,11 @@ jobs:
           java-version: '21'
           distribution: 'temurin'
           cache: maven
+
+      - name: Set up Maven
+        uses: actions/setup-java@v3
+        with:
+          maven-versions: '3.9.9'
+
       - name: Build with Maven
         run: mvn -B -V package