Bump actions/stale from 6 to 7 (#391)

Author: dependabot[bot]

.github/workflows/stale.yml

@@ -13,7 +13,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: 🚀 Run stale
-        uses: actions/stale@v6
+        uses: actions/stale@v7
         with:
           repo-token: ${{ secrets.GITHUB_TOKEN }}
           days-before-stale: 30