Update actions/setup-java action to v2.4.0

Author: renovate-bot

.github/workflows/gradle.yml

@@ -17,7 +17,7 @@ jobs:
     steps:
     - uses: actions/checkout@v2
     - name: Set up JDK 11
-      uses: actions/setup-java@v2.3.1
+      uses: actions/setup-java@v2.4.0
       with:
         java-version: 11
         distribution: 'adopt'