Bump actions/stale from 3.0.19 to 4 (#345)

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

Author: dependabot[bot]

.github/workflows/stale.yaml

@@ -13,7 +13,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: 🚀 Run stale
-        uses: actions/stale@v3.0.19
+        uses: actions/stale@v4
         with:
           repo-token: ${{ secrets.GITHUB_TOKEN }}
           days-before-stale: 30