Send PR to 2.3.x

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01PU6ZgwEtdzRMy98uggy4HS

Author: ondrejmirtes

.github/workflows/send-pr.yml

@@ -31,7 +31,7 @@ jobs:
           repository: phpstan/phpstan-src
           path: phpstan-src
           token: ${{ secrets.PHPSTAN_BOT_TOKEN }}
-          ref: 2.2.x
+          ref: 2.3.x
 
       - name: "Install dependencies"
         working-directory: ./phpstan-src