Generally upgrade dev dependencies

Author: donatj

composer.json

@@ -18,11 +18,11 @@
 		}
 	},
 	"require-dev": {
-		"phpunit/phpunit": "~7.5 | ~9.0",
-		"squizlabs/php_codesniffer": "^3.5",
 		"corpus/coding-standard": "^0.6.0",
-		"friendsofphp/php-cs-fixer": "^2.17",
-		"phpstan/phpstan": "^1.12"
+		"friendsofphp/php-cs-fixer": "^3.4",
+		"phpstan/phpstan": "^1.12",
+		"phpunit/phpunit": "^9.6",
+		"squizlabs/php_codesniffer": "^3.5"
 	},
 	"config": {
 		"allow-plugins": {