[FLINK-38966][build] Update rsync for GHA to latest v8.0.2 (LTS) for main docs

Author: MartijnVisser

.github/workflows/docs.yml

@@ -69,7 +69,7 @@ jobs:
             bash -c "cd /root/flink && ./.github/workflows/docs.sh"
 
       - name: Upload documentation
-        uses: burnett01/rsync-deployments@0dc935cdecc5f5e571865e60d2a6cdc673704823 # 5.2
+        uses: burnett01/rsync-deployments@53581dff6de0d8511d74864451aacee4846bdf39 # 8.0.2
         with:
           switches: --archive --compress --delete
           path: docs/target/
@@ -81,7 +81,7 @@ jobs:
 
       - name: Upload documentation alias
         if: env.flink_alias != ''
-        uses: burnett01/rsync-deployments@0dc935cdecc5f5e571865e60d2a6cdc673704823 # 5.2
+        uses: burnett01/rsync-deployments@53581dff6de0d8511d74864451aacee4846bdf39 # 8.0.2
         with:
           switches: --archive --compress --delete
           path: docs/target/