Update maven.yml

.github/workflows/maven.yml

@@ -20,6 +20,10 @@ jobs:
       if: github.ref == 'refs/heads/master'
       steps:
       - uses: actions/checkout@v1
+      - name: Set up JDK 1.13
+        uses: actions/setup-java@v1
+        with:
+          java-version: 1.13
       - name: Build Final Jar
         run:  mvn clean compile assembly:single
       - name: Copy folder content recursively to remote