Bump workflows to PHP 8.1

Author: mglaman

.github/workflows/php.yml

@@ -15,7 +15,7 @@ jobs:
       uses: "shivammathur/setup-php@v2"
       with:
         coverage: "none"
-        php-version: "7.4"
+        php-version: "8.1"
         tools: composer:v2
     - name: Validate composer.json and composer.lock
       run: composer validate
@@ -27,7 +27,7 @@ jobs:
       uses: "shivammathur/setup-php@v2"
       with:
         coverage: "none"
-        php-version: "7.4"
+        php-version: "8.1"
         tools: composer:v2
     - name: Get Composer Cache Directory
       id: composer-cache
@@ -51,7 +51,7 @@ jobs:
       uses: "shivammathur/setup-php@v2"
       with:
         coverage: "none"
-        php-version: "7.4"
+        php-version: "8.1"
         tools: composer:v2
     - name: Get Composer Cache Directory
       id: composer-cache
@@ -79,7 +79,7 @@ jobs:
         uses: "shivammathur/setup-php@v2"
         with:
           coverage: "none"
-          php-version: "7.4"
+          php-version: "8.1"
           tools: composer:v2
       - name: Get Composer Cache Directory
         id: composer-cache