ci: stale: Switch from app to action

The stale app seems to be unmaintained.

.github/stale.yml

@@ -1,24 +0,0 @@
-# Number of days of inactivity before an issue becomes stale
-daysUntilStale: 60
-# Number of days of inactivity before a stale issue is closed
-daysUntilClose: 7
-# Issues with these labels will never be considered stale
-exemptLabels:
-  - pinned
-  - security
-  - Bug
-  - Serious Bug
-  - Minor bug
-  - Black hole bug
-  - Special case Bug
-  - Upstream bug
-  - Feature Request
-# Label to use when marking an issue as stale
-staleLabel: wontfix
-# Comment to post when marking an issue as stale. Set to `false` to disable
-markComment: >
-  This issue has been automatically marked as stale because it has not had
-  recent activity. It will be closed if no further activity occurs. Thank you
-  for your contributions.
-# Comment to post when closing a stale issue. Set to `false` to disable
-closeComment: false

.github/workflows/stale.yml

@@ -0,0 +1,43 @@
+name: 'Close stale issues and PRs'
+on:
+  schedule:
+    - cron: '30 6 * * *'
+permissions:
+  issues: write
+  pull-requests: write
+jobs:
+  stale:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/stale@v5
+        with:
+          exempt-issue-labels:
+            - pinned
+            - security
+            - Bug
+            - Serious Bug
+            - Minor bug
+            - Black hole bug
+            - Special case Bug
+            - Upstream bug
+            - Feature Request
+          exempt-pr-labels:
+            - pinned
+            - security
+            - Bug
+            - Serious Bug
+            - Minor bug
+            - Black hole bug
+            - Special case Bug
+            - Upstream bug
+            - Feature Request
+          stale-issue-label: wontfix
+          stale-issue-message: >
+            This issue has been automatically marked as stale because it has not
+            had recent activity. It will be closed if no further activity
+            occurs. Thank you for your contributions.
+          stale-pr-label: wontfix
+          stale-pr-message: >
+            This pull request has been automatically marked as stale because it
+            has not had recent activity. It will be closed if no further
+            activity occurs. Thank you for your contributions.