ci: twister: move weekly to sunday [REVERT ME]

Previous job failed, let's give it another try.

Should be reverted once workflow has started.

Signed-off-by: Anas Nashif <[email protected]>

Author: nashif

.github/workflows/twister.yaml

@@ -13,7 +13,7 @@ on:
       - collab-*
   schedule:
     # Run at 17:00 UTC on every Saturday
-    - cron: '0 17 * * 6'
+    - cron: '30 15 * * 7'
 
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