[HttpFoundation] Fixed Mimes dependency missing error

UPGRADE-5.1.md

@@ -36,6 +36,7 @@ HttpFoundation
  * Deprecate `Response::create()`, `JsonResponse::create()`,
    `RedirectResponse::create()`, and `StreamedResponse::create()` methods (use
    `__construct()` instead)
+ * Made the Mime component an optional dependency
 
 Messenger
 ---------

src/Symfony/Component/HttpFoundation/File/File.php

@@ -74,6 +74,10 @@ class File extends \SplFileInfo
      */
     public function getMimeType()
     {
+        if (!class_exists(MimeTypes::class)) {
+            throw new \LogicException('You cannot guess the mime type as the Mime component is not installed. Try running "composer require symfony/mime".');
+        }
+
         return MimeTypes::getDefault()->guessMimeType($this->getPathname());
     }