Remove support for PHP 8.0 and update infection package

This commit drops support for PHP 8.0 in our GitHub workflows to maintain consistency with our current PHP versions. Additionally, it updates the minimum version of the "infection/infection" package required for development to ^0.27 to ensure we are using a more recent, stable version.

.github/workflows/integrate.yml

@@ -52,7 +52,6 @@ jobs:
         operating-system:
           - "ubuntu-latest"
         php-version:
-          - "8.0"
           - "8.1"
           - "8.2"
           - "8.3"

composer.json

@@ -32,7 +32,7 @@
         "symfony/http-kernel": "^5.3|^6.0|^7.0"
     },
     "require-dev": {
-        "infection/infection": "^0.26|^0.27|^0.28",
+        "infection/infection": "^0.27|^0.28",
         "php-parallel-lint/php-parallel-lint": "^1.3",
         "phpstan/extension-installer": "^1.1",
         "phpstan/phpstan": "^1.0",