Update PR-Reviewer default model (#2390)

Fixes OPS-4582.

Author: MarceloRGonc

.github/workflows/pr-reviewer.yml

@@ -10,7 +10,7 @@ on:
       model:
         description: 'Claude model to use'
         required: false
-        default: 'claude-sonnet-4-6'
+        default: 'claude-opus-4-8'
         type: string
 
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