Update php-8-stubs in phpstan-src:1.11.x

Author: ondrejmirtes

.github/workflows/send-pr.yml

@@ -21,7 +21,7 @@ jobs:
         uses: actions/checkout@v4
         with:
           repository: phpstan/phpstan-src
-          ref: 1.10.x
+          ref: 1.11.x
           path: phpstan-src
           token: ${{ secrets.PHPSTAN_BOT_TOKEN }}