build: Update php-parallel-lint to 1.4.0 to fix PHP 8.4 deprecation

Noticed this locally. This is a dev package, so doesn't affect prod.

```
PHP Deprecated:  JakubOnderka\PhpParallelLint\Manager::run():
Implicitly marking parameter $settings as nullable is deprecated
```

Author: Krinkle

composer.json

@@ -3,7 +3,7 @@
         "php": ">= 7.4"
 	},
 	"require-dev": {
-		"php-parallel-lint/php-parallel-lint": "1.3.2"
+		"php-parallel-lint/php-parallel-lint": "1.4.0"
 	},
 	"scripts": {
 		"test": "parallel-lint --exclude vendor/ .",