ci: use github helper to close stale issue

.github/workflows/issue_close_stale.yml

@@ -0,0 +1,21 @@
+name: Close inactive
+
+on:
+  schedule:
+    - cron: "0 0 */7 * *"
+  workflow_dispatch:
+
+jobs:
+  close-inactive:
+    runs-on: ubuntu-latest
+    steps:
+      - name: close-issues
+        uses: actions-cool/issues-helper@v3
+        with:
+          actions: 'close-issues'
+          token: ${{ secrets.GITHUB_TOKEN }}
+          labels: 'stale'
+          inactive-day: 8
+          close-reason: 'not_planned'
+          body: |
+            Hello @${{ github.event.issue.user.login }}, this issue was closed due to inactive more than 52 days. You can reopen or recreate it if you think it should continue.