update to latest shivammathur/setup-php Github Action

Author: staabm

.github/workflows/continuous-integration.yml

@@ -26,7 +26,7 @@ jobs:
         uses: "actions/[email protected]"
 
       - name: "Install PHP"
-        uses: "shivammathur/setup-php@1.8.2"
+        uses: "shivammathur/setup-php@v2"
         with:
           coverage: "none"
           php-version: "${{ matrix.php-version }}"