[workflows] Reduce periodic run on once per week

Author: mshroyer

.github/workflows/periodic.yml

@@ -2,7 +2,7 @@ name: Periodic
 on:
   workflow_dispatch:
   schedule:
-    - cron: "23 1 * * 2,5"
+    - cron: "23 1 * * 2"
 
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