Update - use PHP 8.1

Author: ondrejmirtes

.github/workflows/send-pr.yml

@@ -15,7 +15,7 @@ jobs:
         uses: "shivammathur/setup-php@v2"
         with:
           coverage: "none"
-          php-version: "8.0"
+          php-version: "8.1"
 
       - name: "Checkout phpstan-src"
         uses: actions/checkout@v3

.github/workflows/update.yml

@@ -25,7 +25,7 @@ jobs:
         uses: "shivammathur/setup-php@v2"
         with:
           coverage: "none"
-          php-version: "8.0"
+          php-version: "8.1"
       - name: "Install dependencies"
         run: "composer install"
         working-directory: ./extractor