Maintenance: Bump mime-types from 3.3.1 to 3.4.0

Bumps [mime-types](https://github.com/mime-types/ruby-mime-types) from 3.3.1 to 3.4.0.
- [Release notes](https://github.com/mime-types/ruby-mime-types/releases)
- [Changelog](https://github.com/mime-types/ruby-mime-types/blob/main/History.md)
- [Commits](https://github.com/mime-types/ruby-mime-types/compare/v3.3.1...v3.4.0)

Gemfile.lock

@@ -321,9 +321,9 @@ GEM
       thread_safe (~> 0.3, >= 0.3.1)
     messagebird-rest (3.0.0)
     method_source (1.0.0)
-    mime-types (3.3.1)
+    mime-types (3.4.0)
       mime-types-data (~> 3.2015)
-    mime-types-data (3.2021.0901)
+    mime-types-data (3.2021.1115)
     mini_mime (1.1.2)
     mini_portile2 (2.6.1)
     mini_racer (0.2.9)