Bump rack-attack from 5.2.0 to 5.4.1 (#8838)

Bumps [rack-attack](https://github.com/kickstarter/rack-attack) from 5.2.0 to 5.4.1.
- [Release notes](https://github.com/kickstarter/rack-attack/releases)
- [Changelog](https://github.com/kickstarter/rack-attack/blob/master/CHANGELOG.md)
- [Commits](https://github.com/kickstarter/rack-attack/compare/v5.2.0...v5.4.1)

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

Gemfile

@@ -66,7 +66,7 @@ gem 'ox', '~> 2.10'
 gem 'posix-spawn', git: 'https://github.com/rtomayko/posix-spawn', ref: '58465d2e213991f8afb13b984854a49fcdcc980c'
 gem 'pundit', '~> 1.1'
 gem 'premailer-rails'
-gem 'rack-attack', '~> 5.2'
+gem 'rack-attack', '~> 5.4'
 gem 'rack-cors', '~> 1.0', require: 'rack/cors'
 gem 'rails-i18n', '~> 5.1'
 gem 'rails-settings-cached', '~> 0.6'

Gemfile.lock

@@ -420,8 +420,8 @@ GEM
       activesupport (>= 3.0.0)
     raabro (1.1.6)
     rack (2.0.5)
-    rack-attack (5.2.0)
+    rack-attack (5.4.1)
-      rack
+      rack (>= 1.0, < 3)
     rack-cors (1.0.2)
     rack-protection (2.0.4)
       rack
@@ -727,7 +727,7 @@ DEPENDENCIES
   pry-rails (~> 0.3)
   puma (~> 3.11)
   pundit (~> 1.1)
-  rack-attack (~> 5.2)
+  rack-attack (~> 5.4)
   rack-cors (~> 1.0)
   rails (~> 5.2.1)
   rails-controller-testing (~> 1.0)