[hotfix] Add --omit-dir-times to legacy docs rsync to fix permission errors

Author: MartijnVisser

.github/workflows/docs-legacy.yml

@@ -86,7 +86,7 @@ jobs:
       - name: Upload documentation
         uses: burnett01/rsync-deployments@0dc935cdecc5f5e571865e60d2a6cdc673704823 # 5.2
         with:
-          switches: --archive --compress --delete
+          switches: --archive --compress --delete --omit-dir-times
           path: docs/target/
           remote_path: ${{ secrets.NIGHTLIES_RSYNC_PATH }}/flink/flink-docs-${{ env.flink_branch }}/
           remote_host: ${{ secrets.NIGHTLIES_RSYNC_HOST }}