update deprecated github output

Author: gschueler

.github/workflows/gradle.yml

@@ -25,7 +25,7 @@ jobs:
         run: ./gradlew build
       - name: Get Release Version
         id: get_version
-        run: VERSION=$(./gradlew currentVersion -q -Prelease.quiet) && echo ::set-output name=VERSION::$VERSION
+        run: VERSION=$(./gradlew currentVersion -q -Prelease.quiet) && echo "VERSION=$VERSION" >> $GITHUB_OUTPUT
       - name: Upload sshj-plugin jar
         uses: actions/upload-artifact@v4
         with: