feature #34119 [Mime] Added MimeType for "msg" (LIBERT Jérémy)

This PR was submitted for the 4.3 branch but it was merged into the 5.1-dev branch instead (closes #34119).

Discussion
----------

[Mime] Added MimeType for "msg"

| Q             | A
| ------------- | ---
| Branch?       | 4.3
| Bug fix?      | no
| New feature?  | no
| Deprecations? | no
| Tickets       | -
| License       | MIT
| Doc PR        | -

Commits
-------

d6ccd4c Added MimeType for ".msg"

src/Symfony/Component/Mime/MimeTypes.php

@@ -526,6 +526,7 @@ public function guessMimeType(string $path): ?string
         'application/vnd.ms-ims' => ['ims'],
         'application/vnd.ms-lrm' => ['lrm'],
         'application/vnd.ms-officetheme' => ['thmx'],
+        'application/vnd.ms-outlook' => ['msg'],
         'application/vnd.ms-pki.seccat' => ['cat'],
         'application/vnd.ms-pki.stl' => ['stl'],
         'application/vnd.ms-powerpoint' => ['ppt', 'pps', 'pot', 'ppz'],
@@ -2374,6 +2375,7 @@ public function guessMimeType(string $path): ?string
         'mseed' => ['application/vnd.fdsn.mseed'],
         'mseq' => ['application/vnd.mseq'],
         'msf' => ['application/vnd.epson.msf'],
+        'msg' => ['application/vnd.ms-outlook'],
         'msh' => ['model/mesh'],
         'msi' => ['application/x-msdownload', 'application/x-msi'],
         'msl' => ['application/vnd.mobius.msl'],