style(php-cs-fixer): lint php files and fix coding standards

src/Traffic/Message/Multipart/Part.php

@@ -41,7 +41,7 @@ public static function create(array $headers): Part
             $fileName = \preg_match(
                 '/\bfilename=(?:(?<a>[^" ;,]++)|"(?<b>[^"]++)")/',
                 $contentDisposition,
-                $matches
+                $matches,
             ) === 1 ? ($matches['a'] ?: $matches['b']) : null;
         }