Updated outdated actions/setup-java to v4 (#371)

Currently used version (v1) doesn't support distribution `sapmachine`

Author: mofterdinger

.github/workflows/maven.yml

@@ -20,10 +20,12 @@ jobs:
 
     steps:
     - uses: actions/checkout@v2
+
     - name: Set up JDK
-      uses: actions/setup-java@v1
+      uses: actions/setup-java@v4
       with:
         java-version: 17
         distribution: 'sapmachine'
+
     - name: Build with Maven
       run: mvn -ntp -B clean install