Merge pull request matplotlib#30922 from timhoffm/ci-stale-run-frequency

Reduce stale bot to run once per week

Author: jklymak

.github/workflows/stale.yml

@@ -2,7 +2,7 @@
 name: 'Label inactive PRs'
 on:
   schedule:
-    - cron: '30 1 * * 1,3,5'
+    - cron: '30 1 * * 1'
 
 jobs:
   stale: