Delete stale Action to avoid missing unanswered issues.

.github/workflows/stale.yml

@@ -1,19 +0,0 @@
-name: Mark stale issues and pull requests
-
-on:
-  schedule:
-  - cron: "0 3 * * *"
-
-jobs:
-  stale:
-
-    runs-on: ubuntu-latest
-
-    steps:
-    - uses: actions/stale@v1
-      with:
-        repo-token: ${{ secrets.GITHUB_TOKEN }}
-        stale-issue-message: 'This issue has not had any activity for 45 days and will be closed in 45 days if there continues to be no activity.'
-        stale-issue-label: 'no-issue-activity'
-        days-before-stale: 45
-        days-before-close: 45