ci: upgrade actions/stale from v10 to v11 (#623)

Author: adrianhall

.github/workflows/stale-issues.yml

@@ -24,7 +24,7 @@ jobs:
       pull-requests: write
 
     steps:
-    - uses: actions/stale@v10
+    - uses: actions/stale@v11
       with:
         repo-token: ${{ secrets.GITHUB_TOKEN }}
         days-before-stale: 21
@@ -39,7 +39,7 @@ jobs:
         stale-issue-label: 'stale'
         stale-pr-label: 'stale'
 
-    - uses: actions/stale@v10
+    - uses: actions/stale@v11
       with:
         repo-token: ${{ secrets.GITHUB_TOKEN }}
         days-before-stale: 5