Bump Symfony 8 to PHP >= 8.4

Author: nicolas-grekas

composer.json

@@ -19,14 +19,11 @@
         "psr/link-implementation": "1.0|2.0"
     },
     "require": {
-        "php": ">=8.2",
+        "php": ">=8.4",
         "psr/link": "^1.1|^2.0"
     },
     "require-dev": {
-        "symfony/http-kernel": "^6.4|^7.0|^8.0"
-    },
-    "conflict": {
-        "symfony/http-kernel": "<6.4"
+        "symfony/http-kernel": "^7.4|^8.0"
     },
     "autoload": {
         "psr-4": { "Symfony\\Component\\WebLink\\": "" },