Add release version bump to release ci

Signed-off-by: Heiko Kiesel <heiko.kiesel@iteratec.com>

Author: Heiko Kiesel

.github/workflows/release.yml

@@ -25,6 +25,8 @@ jobs:
         uses: gradle/wrapper-validation-action@v1.1.0
       - name: Setup Gradle
         uses: gradle/gradle-build-action@v2.7.0
+      - name: Bump version
+        run: ./gradlew release
       - name: Publish to Maven Central
         run: ./gradlew publish
         env: