Drop support for PHP <8.3 and Symfony <7.4

PHP 8.1 reached EOL in November 2024, PHP 8.2 active support ended
December 2024. Symfony 6.4 LTS support continues but aligning with
the Symfony 7.4 LTS-only stance simplifies the matrix and removes
the separate include entry.

Co-Authored-By: Claude Sonnet 4.6 (1M context) <noreply@anthropic.com>

composer.json

@@ -11,10 +11,10 @@
         }
     ],
     "require": {
-        "php": "^8.1",
+        "php": "^8.3",
         "behat/behat": "^3.22",
-        "symfony/dependency-injection": "^6.4 || ^7.0",
-        "symfony/http-kernel": "^6.4 || ^7.0"
+        "symfony/dependency-injection": "^7.4",
+        "symfony/http-kernel": "^7.4"
     },
     "require-dev": {
         "behat/mink-browserkit-driver": "^2.0",
@@ -24,10 +24,10 @@
         "friends-of-behat/page-object-extension": "^0.3.2",
         "friends-of-behat/service-container-extension": "^1.1",
         "sylius-labs/coding-standard": ">=4.1.1, <=4.2.1",
-        "symfony/browser-kit": "^6.4 || ^7.0",
-        "symfony/framework-bundle": "^6.4 || ^7.0",
-        "symfony/process": "^6.4 || ^7.0",
-        "symfony/yaml": "^6.4 || ^7.0",
+        "symfony/browser-kit": "^7.4",
+        "symfony/framework-bundle": "^7.4",
+        "symfony/process": "^7.4",
+        "symfony/yaml": "^7.4",
         "vimeo/psalm": "^6.0"
     },
     "suggest": {