Bump mime-types from 3.1 to 3.2.2 (#8781)

Bumps [mime-types](https://github.com/mime-types/ruby-mime-types) from 3.1 to 3.2.2.
- [Release notes](https://github.com/mime-types/ruby-mime-types/releases)
- [Changelog](https://github.com/mime-types/ruby-mime-types/blob/master/History.md)
- [Commits](https://github.com/mime-types/ruby-mime-types/compare/v3.1...v3.2.2)

Signed-off-by: dependabot[bot] <support@dependabot.com>

Gemfile

@@ -56,7 +56,7 @@ gem 'httplog', '~> 1.0'
 gem 'idn-ruby', require: 'idn'
 gem 'kaminari', '~> 1.1'
 gem 'link_header', '~> 0.0'
-gem 'mime-types', '~> 3.1', require: 'mime/types/columnar'
+gem 'mime-types', '~> 3.2', require: 'mime/types/columnar'
 gem 'nokogiri', '~> 1.8'
 gem 'nsa', '~> 0.2'
 gem 'oj', '~> 3.5'

Gemfile.lock

@@ -331,9 +331,9 @@ GEM
     microformats (4.0.7)
       json
       nokogiri
-    mime-types (3.1)
+    mime-types (3.2.2)
       mime-types-data (~> 3.2015)
-    mime-types-data (3.2016.0521)
+    mime-types-data (3.2018.0812)
     mimemagic (0.3.2)
     mini_mime (1.0.0)
     mini_portile2 (2.3.0)
@@ -700,7 +700,7 @@ DEPENDENCIES
   mario-redis-lock (~> 1.2)
   memory_profiler
   microformats (~> 4.0)
-  mime-types (~> 3.1)
+  mime-types (~> 3.2)
   net-ldap (~> 0.10)
   nokogiri (~> 1.8)
   nsa (~> 0.2)