Bump rack-attack from 6.2.2 to 6.3.0 (#13657)

Bumps [rack-attack](https://github.com/kickstarter/rack-attack) from 6.2.2 to 6.3.0.
- [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/v6.2.2...v6.3.0)

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

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

Gemfile

@@ -75,7 +75,7 @@ gem 'parallel', '~> 1.19'
 gem 'posix-spawn', git: 'https://github.com/rtomayko/posix-spawn', ref: '58465d2e213991f8afb13b984854a49fcdcc980c'
 gem 'pundit', '~> 2.1'
 gem 'premailer-rails'
-gem 'rack-attack', '~> 6.2'
+gem 'rack-attack', '~> 6.3'
 gem 'rack-cors', '~> 1.1', require: 'rack/cors'
 gem 'rails-i18n', '~> 5.1'
 gem 'rails-settings-cached', '~> 0.6'

Gemfile.lock

@@ -440,7 +440,7 @@ GEM
       activesupport (>= 3.0.0)
     raabro (1.1.6)
     rack (2.2.2)
-    rack-attack (6.2.2)
+    rack-attack (6.3.0)
       rack (>= 1.0, < 3)
     rack-cors (1.1.1)
       rack (>= 2.0.0)
@@ -752,7 +752,7 @@ DEPENDENCIES
   puma (~> 4.3)
   pundit (~> 2.1)
   rack (~> 2.2.2)
-  rack-attack (~> 6.2)
+  rack-attack (~> 6.3)
   rack-cors (~> 1.1)
   rails (~> 5.2.4.2)
   rails-controller-testing (~> 1.0)