Remove stale action

fixed: #4479

.github/workflows/stale.yml

@@ -1,22 +0,0 @@
-name: PR auto close, if you stay more than 8 days open
-
-on:
-  workflow_dispatch:
-  schedule:
-  - cron: '0 0 * * *'
-
-jobs:
-  stale:
-    runs-on: ubuntu-latest
-    steps:
-    - uses: actions/stale@v1
-      with:
-        repo-token: ${{ secrets.GITHUB_TOKEN }}
-        stale-pr-message: >
-          This PR has been automatically marked as stale because it has not had
-          recent activity. They will wait 15 days for your interaction, after
-          that the PR will be closed.
-          Please read more in https://github.com/avelino/awesome-go/blob/master/CONTRIBUTING.md
-        stale-pr-label: 'stale'
-        days-before-stale: 15
-        days-before-close: 7