Replace Probot Stale with GitHub Action

Looks like Probot Stale is abandoned... Too bad. 😒

.github/workflows/stale.yml

@@ -0,0 +1,28 @@
+name: "Mark or close stale issues and PRs"
+on:
+  schedule:
+    - cron: "0 12 * * *"
+
+jobs:
+  stale:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/stale@v3
+        with:
+          repo-token: ${{ secrets.GITHUB_TOKEN }}
+          days-before-stale: 7
+          days-before-close: 2
+          stale-issue-message: >
+            This issue has been automatically marked as stale because it has not had
+            recent activity. It will be closed in two days if no further activity
+            occurs. Thank you for your contributions! :+1:
+          stale-pr-message: >
+            This pull request has been automatically marked as stale because it has not had
+            recent activity. It will be closed in two days if no further activity
+            occurs. Thank you for your contributions! :+1:
+          stale-pr-label: "info: Stale"
+          stale-issue-label: "info: Stale"
+          exempt-issue-labels: "type: Bug,type: Enhancement,type: Feature,type: Idea,type: Release,info: Pinned"
+          exempt-pr-labels: "type: Bug,type: Enhancement,type: Feature,type: Idea,type: Release,info: Pinned"
+          remove-stale-when-updated: true
+