Bump mime-types from 3.2.2 to 3.3.1

Bumps [mime-types](https://github.com/mime-types/ruby-mime-types) from 3.2.2 to 3.3.1:
  - [Changelog](https://github.com/mime-types/ruby-mime-types/blob/master/History.md)
  - [Commits](mime-types/ruby-mime-types@v3.2.2...v3.3.1)

---

Updated to include
[mime-types/ruby-mimetypes#176](mime-types/ruby-mime-types#146)
which silences the warnings about `MIME::Types::Logger`:

```
./seal/.bundle/ruby/2.7.0/gems/mime-types-3.2.2/lib/mime/types/logger.rb:30: warning: `_1' is reserved for numbered parameter; consider another name
./seal/.bundle/ruby/2.7.0/gems/mime-types-3.2.2/lib/mime/types/logger.rb:30: warning: `_2' is reserved for numbered parameter; consider another name
./seal/.bundle/ruby/2.7.0/gems/mime-types-3.2.2/lib/mime/types/logger.rb:30: warning: `_3' is reserved for numbered parameter; consider another name
```

Used `bundle update mime-types` to do the bump.

Gemfile.lock

@@ -18,9 +18,9 @@ GEM
       oj (~> 2)
       trollop (~> 2)
     method_source (0.9.2)
-    mime-types (3.2.2)
+    mime-types (3.3.1)
       mime-types-data (~> 3.2015)
-    mime-types-data (3.2018.0812)
+    mime-types-data (3.2021.0225)
     multi_xml (0.6.0)
     multipart-post (2.0.0)
     mustermann (1.1.1)