removed PHP 7.2 from GitHub Actions

Author: petrparolek

.github/workflows/main.yaml

@@ -138,11 +138,11 @@ jobs:
 
         strategy:
             matrix:
-                php-version: ["7.2", "7.3", "7.4"]
+                php-version: ["7.3", "7.4"]
                 operating-system: ["ubuntu-latest"]
                 composer-args: [ "" ]
                 include:
-                    - php-version: "7.2"
+                    - php-version: "7.3"
                       operating-system: "ubuntu-latest"
                       composer-args: "--prefer-lowest"
                     - php-version: "8.0"