Bump actions/stale from 9.1.0 to 10.0.0 (exercism#3999)

Bumps [actions/stale](https://github.com/actions/stale) from 9.1.0 to 10.0.0.
- [Release notes](https://github.com/actions/stale/releases)
- [Changelog](https://github.com/actions/stale/blob/main/CHANGELOG.md)
- [Commits](actions/stale@5bef64f...3a9db7e)

---
updated-dependencies:
- dependency-name: actions/stale
  dependency-version: 10.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/stale.yml

@@ -8,7 +8,7 @@ jobs:
   stale:
     runs-on: ubuntu-24.04
     steps:
-      - uses: actions/stale@5bef64f19d7facfb25b37b414482c7164d639639
+      - uses: actions/stale@3a9db7e6a41a89f618792c92c0e97cc736e1b13f
         with:
           repo-token: ${{ secrets.GITHUB_TOKEN }}
           days-before-stale: 21