Fix github output variable name

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

Author: Heiko Kiesel

.github/workflows/release.yml

@@ -47,7 +47,7 @@ jobs:
       # currentVersion command gets this value, which we store in the "version" variable for following jobs.
       - name: Get current version
         id: version
-        run: echo "version=$(./gradlew -q -Prelease.quiet currentVersion)" >> "$VERSION"
+        run: echo "VERSION=$(./gradlew -q -Prelease.quiet currentVersion)" >> "$GITHUB_OUTPUT"
 
   maven:
     runs-on: ubuntu-22.04