Update actions/setup-java action to v3

Author: renovate-bot

.github/workflows/maven.yml

@@ -10,7 +10,7 @@ jobs:
     - uses: actions/checkout@v2
 
     - name: Set up JDK 15
-      uses: actions/setup-java@v2
+      uses: actions/setup-java@v3
       with:
         distribution: 'adopt'
         java-version: 15