github: Remove stale bot configuration

.github/workflows/stale.yml

@@ -1,30 +0,0 @@
-name: Mark stale issues and pull requests
-
-on:
-  schedule:
-  - cron: "00 0 * * *"
-
-jobs:
-  stale:
-
-    runs-on: ubuntu-latest
-
-    steps:
-    - uses: actions/stale@v3
-      with:
-        repo-token: ${{ secrets.GITHUB_TOKEN }}
-
-        stale-issue-message: "Is this issue still an issue for you? Please do comment and let us know! Alternatively, you may close the issue yourself if it is no longer an problem"
-        stale-pr-message: "Is this PR still being worked on? Please do comment and let us know! Alternatively, you may close the PR yourself if you no longer wish to work on the PR."
-
-        close-issue-message: "This issue will now be closed due to inactivty. It may be reopened if the demand indicates it should be."
-        close-pr-message: "This PR will now be closed due to inactivty. It may be reopened if the demand indicates it should be."
-
-        days-before-stale: 182
-        days-before-close: -1
-
-        stale-issue-label: "no-issue-activity"
-        stale-pr-label: "no-pr-activity"
-
-        exempt-issue-labels: "work-in-progress,security,critical"
-        exempt-pr-labels: "awaiting-approval,work-in-progress"