feat: support symfony/process ^8.0 (#15)

Author: xepozz

composer.json

@@ -10,7 +10,7 @@
     "license": "MIT",
     "require": {
         "php": "^8.0",
-        "symfony/process": "^5.4 || ^6.0 || ^7.0",
+        "symfony/process": "^5.4 || ^6.0 || ^7.0 || ^8.0",
         "composer-runtime-api": "^2.0",
         "composer/semver": "^3.3"
     },