ci: 🚚 move to stale action since stale bot is deprecated.

See https://github.com/probot/stale#-the-stale-app-is-deprecated-and-this-repository-is-no-longer-maintained

.github/workflows/stale.yml

@@ -0,0 +1,16 @@
+name: 'Close stale issues and PRs'
+on:
+  schedule:
+    - cron: '30 1 * * *'
+
+jobs:
+  stale:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/stale@v9
+        with:
+          stale-issue-message: 'This issue is stale because it has been open 30 days with no activity. Remove stale label or comment or this will be closed in 5 days.'
+          close-issue-message: 'This issue was closed because it has been stalled for 5 days with no activity.'
+          exempt-issue-labels: 'awaiting-approval,work-in-progress,planned'
+          days-before-issue-stale: 30
+          days-before-issue-close: 5