Update gradle/actions action to v6

Author: renovate[bot]

.github/workflows/release.yaml

@@ -24,7 +24,7 @@ jobs:
           echo "VERSION=${DATE}-${HASH}" >> $GITHUB_ENV
 
       - name: Setup Gradle
-        uses: gradle/actions/setup-gradle@v4
+        uses: gradle/actions/setup-gradle@v6
 
       # https://vanniktech.github.io/gradle-maven-publish-plugin/central
       - name: Publish package