Update GitHub actions release flow to v4 (#161)

Author: johann-beleites-sonarsource

.github/workflows/release.yml

@@ -30,7 +30,7 @@ jobs:
           RELEASE_SSH_USER: ${{ secrets.RELEASE_SSH_USER }}
           RELEASE_SSH_KEY: ${{ secrets.RELEASE_SSH_KEY }}
           SLACK_API_TOKEN: ${{secrets.SLACK_API_TOKEN }}
-        uses: SonarSource/gh-action_release/main@v3
+        uses: SonarSource/gh-action_release/main@v4
 
       - name: Release action results
         if: always()
@@ -58,14 +58,14 @@ jobs:
         id: local_repo
         run: echo ::set-output name=dir::"$(mktemp -d repo.XXXXXXXX)"
       - name: Download Artifacts
-        uses: SonarSource/gh-action_release/download-build@v3
+        uses: SonarSource/gh-action_release/download-build@v4
         with:
           build-number: ${{ steps.get_version.outputs.build }}
           local-repo-dir: ${{ steps.local_repo.outputs.dir }}
       - name: Maven Central Sync
         id: maven-central-sync
         continue-on-error: true
-        uses: SonarSource/gh-action_release/maven-central-sync@v3
+        uses: SonarSource/gh-action_release/maven-central-sync@v4
         with:
           local-repo-dir: ${{ steps.local_repo.outputs.dir }}
         env: