[KYUUBI #4193] Bump actions/stale from v6 to v7

### _Why are the changes needed?_

- Bump actions/stale from v6 to v7 (release note:https://github.com/actions/stale/releases/tag/v7.0.0)
- Breaking change in v7 which we didn't use. `no longer managing the stale label on items included in exempt-issue-labels and exempt-pr-labels.` as shown in the link above.

### _How was this patch tested?_
CI action pass.

Closes #4193 from bowenliang123/actions-stale-v7.

Closes #4193

7cf9da7f [liangbowen] bump actions/stale from v6 to v7

Authored-by: liangbowen <liangbowen@gf.com.cn>
Signed-off-by: liangbowen <liangbowen@gf.com.cn>

.github/workflows/stale.yml

@@ -27,7 +27,7 @@ jobs:
     permissions:
       pull-requests: write
     steps:
-      - uses: actions/stale@v6
+      - uses: actions/stale@v7
         with:
           repo-token: ${{ secrets.GITHUB_TOKEN }}
           stale-pr-message: >