Potential fix for code scanning alert no. 2: Workflow does not contain permissions (#99)

Co-authored-by: Copilot Autofix powered by AI <62310815+github-advanced-security[bot]@users.noreply.github.com>

Author: thpierce

.github/workflows/stale-bot.yml

@@ -12,6 +12,10 @@
 # permissions and limitations under the License.
 
 name: 'Close stale issues and PR'
+permissions:
+  contents: read
+  issues: write
+  pull-requests: write
 on:
   schedule:
     - cron: '0 20 * * SUN' # every Sunday at 20 am UTC: PST 0:00 AM "