Update pull request trigger types in workflow

Removed 'opened' type from pull request trigger.

Signed-off-by: Aviv Keller <me@aviv.sh>

Author: avivkeller

.github/workflows/request-codeowner-review.yml

@@ -2,7 +2,6 @@ name: Request Codeowner Reviews
 
 on:
   pull_request:
-    types: [opened]
 
 permissions:
   contents: read