Format code with php-cs-fixer

This commit fixes the style issues introduced in d25eaef according to the output
from php-cs-fixer.

Details: https://deepsource.io/gh/FriendsOfShopware/FroshTools/transform/9270e98a-e7c5-4530-8c30-7f86751fc141/

Author: deepsource-autofix[bot]

src/Components/CacheHelper.php

@@ -66,6 +66,7 @@ public static function removeDir(string $path): void
         // If the given path is a file
         if (is_file($path)) {
             unlink($path);
+
             return;
         }
 

src/Components/Exception/CannotClearCacheException.php

@@ -1,4 +1,4 @@
-<?php
+<?php declare(strict_types=1);
 
 namespace Frosh\Tools\Components\Exception;
 
@@ -10,4 +10,4 @@ public function getErrorCode(): string
     {
         return 'FROSH_TOOLS_CANNOT_CLEAR_CACHE';
     }
-}
+}