Fix java version in Github action

Author: devnied

.github/workflows/maven.yml

@@ -32,6 +32,6 @@ jobs:
       uses: actions/setup-java@v2
       with:
         distribution: 'zulu'
-        java-version: 1.8
+        java-version: 8
     - name: Build with Maven
       run: mvn -B clean cobertura:cobertura coveralls:report -DrepoToken=${{ secrets.COVERALLS_TOKEN }}