gems(deps): bump mime-types-data from 3.2021.0225 to 3.2021.0704

Bumps [mime-types-data](https://github.com/mime-types/mime-types-data) from 3.2021.0225 to 3.2021.0704.
- [Release notes](https://github.com/mime-types/mime-types-data/releases)
- [Changelog](https://github.com/mime-types/mime-types-data/blob/master/History.md)
- [Commits](mime-types/mime-types-data@v3.2021.0225...v3.2021.0704)

---
updated-dependencies:
- dependency-name: mime-types-data
  dependency-type: indirect
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Gemfile.lock

@@ -111,7 +111,7 @@ GEM
     method_source (1.0.0)
     mime-types (3.3.1)
       mime-types-data (~> 3.2015)
-    mime-types-data (3.2021.0225)
+    mime-types-data (3.2021.0704)
     mini_magick (4.11.0)
     mini_mime (1.1.0)
     minitest (5.14.4)