Close stale issues as not planned

**User-Facing Changes**
None

**Description**
Uses actions/stale#764 to close issues as not planned instead of completed

.github/workflows/stale.yml

@@ -8,14 +8,15 @@ jobs:
   stale:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/stale@v5
+      - uses: actions/stale@v5.1.1
         with:
           operations-per-run: 250
 
           stale-issue-message: "This issue has been marked as stale because there has been no activity in the past 6 months. Please add a comment to keep it open."
           stale-issue-label: stale
           days-before-issue-stale: 180
           days-before-issue-close: 30
+          close-issue-reason: not_planned
 
           stale-pr-message: "This PR has been marked as stale because there has been no activity in the past 6 months. Please add a comment to keep it open. Thank you for your contribution."
           stale-pr-label: stale