🔧 add github action for handling stale PRs (#376)

.github/workflows/stale.yml

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+name: 'Close stale PRs'
+on:
+  schedule:
+    - cron: '30 1 * * *'
+
+jobs:
+  stale:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/stale@v8
+        with:
+          stale-pr-message: 'This PR 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-pr-message: 'This PR was closed because it has been stalled for 5 days with no activity.'
+          days-before-stale: 30
+          days-before-close: 5
+          days-before-issue-stale: -1

upcoming-release-notes/376.md

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+---
+category: Maintenance
+authors: [MatissJanis]
+---
+
+Add Github action for stale PRs.