fix for php version

Author: matt

.github/workflows/buildchecks.yml

@@ -39,7 +39,7 @@ jobs:
       - name: Setup PHP
         uses: "shivammathur/setup-php@v2"
         with:
-          php-version: "7.4"
+          php-version: "8.1"
           ini-values: "memory_limit=1G"
           coverage: none
           tools: cs2pr