chore(deps): update actions/stale action to v8 (#7892)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [actions/stale](https://togithub.com/actions/stale) | action | major |
`v7` -> `v8` |

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### ⚠ Dependency Lookup Warnings ⚠

Warnings were logged while processing this repo. Please check the
Dependency Dashboard for more information.

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### Release Notes

<details>
<summary>actions/stale</summary>

### [`v8`](https://togithub.com/actions/stale/compare/v7...v8)

[Compare Source](https://togithub.com/actions/stale/compare/v7...v8)

</details>

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### Configuration

📅 **Schedule**: Branch creation - At any time (no schedule defined),
Automerge - At any time (no schedule defined).

🚦 **Automerge**: Disabled by config. Please merge this manually once you
are satisfied.

♻ **Rebasing**: Whenever PR becomes conflicted, or you tick the
rebase/retry checkbox.

🔕 **Ignore**: Close this PR and you won't be reminded about this update
again.

---

- [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check
this box

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.github/workflows/stale.yaml

@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-20.04
     steps:
       - name: Check for stale issues and PRs
-        uses: actions/stale@6f05e4244c9a0b2ed3401882b05d701dd0a7289b # v7
+        uses: actions/stale@1160a2240286f5da8ec72b1c0816ce2481aabf84 # v8
         with:
           repo-token: ${{ secrets.BOT_TOKEN }}
           days-before-issue-stale: 180