ci: pull champions data on Thursdays after upstream scrape

loldle-data scrapes Thursday 06:00 UTC but GitHub queues it 2-4h late, so pull at 12:00 UTC the same day instead of the following Monday.

web/.github/workflows/sync-data.yml

@@ -2,8 +2,9 @@ name: Sync champions data
 
 on:
   schedule:
-    # Every Monday at 06:00 UTC
-    - cron: '0 6 * * 1'
+    # Thursdays 12:00 UTC, after loldle-data's own 06:00 UTC scrape
+    # (GitHub queues scheduled runs 2-4h late, so leave a wide margin)
+    - cron: '0 12 * * 4'
   workflow_dispatch:
 
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