chore: use Cysharp/Actions reusable workflow stale

.github/workflows/stale.yml

@@ -1,24 +1,10 @@
 name: "Close stale issues"
 
 on:
+  workflow_dispatch:
   schedule:
     - cron: "0 0 * * *"
 
 jobs:
   stale:
-    runs-on: ubuntu-latest
+    uses: Cysharp/Actions/.github/workflows/stale-issue.yaml@main
-    steps:
-      - uses: actions/stale@v3
-        with:
-          repo-token: ${{ secrets.GITHUB_TOKEN }}
-          # enable issue
-          stale-issue-message: "This issue is stale because it has been open 90 days with no activity. Remove stale label or comment or this will be closed in 7 days."
-          stale-issue-label: "stale"
-          # enable pr
-          stale-pr-message: "This PR is stale because it has been open 90 days with no activity. Remove stale label or comment or this will be closed in 7 days."
-          stale-pr-label: "stale"
-          days-before-stale: 90
-          days-before-close: 7
-          exempt-issue-labels: "wip"
-          exempt-pr-labels: "wip"
-          remove-stale-when-updated: true