Bump actions/stale from v3.0.14 to v3.0.15 (#9)

Bumps [actions/stale](https://github.com/actions/stale) from v3.0.14 to v3.0.15.
- [Release notes](https://github.com/actions/stale/releases)
- [Commits](actions/stale@v3.0.14...8656146)

Signed-off-by: dependabot[bot] <support@github.com>

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

.github/workflows/stale.yaml

@@ -13,7 +13,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: 🚀 Run stale
-        uses: actions/stale@v3.0.14
+        uses: actions/stale@v3.0.15
         with:
           repo-token: ${{ secrets.GITHUB_TOKEN }}
           days-before-stale: 30