data-update.yml: updated on the 28th of the month

Administrators of public instances are incentivised to update their instances on the 1st of the month.

With this commit, the data are up to date by the 1st of the next month.

.github/workflows/data-update.yml

@@ -1,7 +1,7 @@
 name: "Update searx.data"
 on:
   schedule:
-    - cron: "05 06 1 * *"
+    - cron: "05 06 28 * *"
   workflow_dispatch:
 
 jobs: