Update to PHP 8 deps

Author: rowan-m

composer.json

@@ -10,12 +10,12 @@
         "source": "https://github.com/google/recaptcha"
     },
     "require": {
-        "php": ">=5.5"
+        "php": ">=8"
     },
     "require-dev": {
-        "phpunit/phpunit": "^4.8.36|^5.7.27|^6.59|^7.5.11",
-        "friendsofphp/php-cs-fixer": "^2.2.20|^2.15",
-        "php-coveralls/php-coveralls": "^2.1"
+        "phpunit/phpunit": "^10",
+        "friendsofphp/php-cs-fixer": "^3.14",
+        "php-coveralls/php-coveralls": "^2.5"
     },
     "autoload": {
         "psr-4": {
@@ -28,9 +28,9 @@
         }
     },
     "scripts": {
-        "lint": "vendor/bin/php-cs-fixer -vvv fix --using-cache=no --dry-run .",
-        "lint-fix": "vendor/bin/php-cs-fixer -vvv fix --using-cache=no .",
-        "test": "vendor/bin/phpunit --colors=always",
+        "lint": "PHP_CS_FIXER_IGNORE_ENV=1 vendor/bin/php-cs-fixer -vvv fix --using-cache=no --dry-run .",
+        "lint-fix": "PHP_CS_FIXER_IGNORE_ENV=1 vendor/bin/php-cs-fixer -vvv fix --using-cache=no .",
+        "test": "XDEBUG_MODE=coverage vendor/bin/phpunit",
         "serve-examples": "@php -S localhost:8080 -t examples"
     },
     "config": {