Bump doorkeeper from 5.4.0 to 5.5.0

Bumps [doorkeeper](https://github.com/doorkeeper-gem/doorkeeper) from 5.4.0 to 5.5.0.
- [Release notes](https://github.com/doorkeeper-gem/doorkeeper/releases)
- [Changelog](https://github.com/doorkeeper-gem/doorkeeper/blob/main/CHANGELOG.md)
- [Commits](doorkeeper-gem/doorkeeper@v5.4.0...v5.5.0)

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

Gemfile

@@ -5,7 +5,7 @@ source "http://rubygems.org"
 ruby "2.6.5"
 
 gem "rails", "~> 6.1"
-gem "doorkeeper", "~> 5.4.0"
+gem "doorkeeper", "~> 5.5.0"
 gem "devise", "~> 4.7"
 
 gem "faker"

Gemfile.lock

@@ -79,7 +79,7 @@ GEM
       responders
       warden (~> 1.2.3)
     diff-lcs (1.4.4)
-    doorkeeper (5.4.0)
+    doorkeeper (5.5.0)
       railties (>= 5)
     erubi (1.10.0)
     execjs (2.7.0)
@@ -93,7 +93,7 @@ GEM
     ffi (1.14.2)
     globalid (0.4.2)
       activesupport (>= 4.2.0)
-    i18n (1.8.8)
+    i18n (1.8.9)
       concurrent-ruby (~> 1.0)
     jquery-rails (4.4.0)
       rails-dom-testing (>= 1, < 3)
@@ -246,7 +246,7 @@ DEPENDENCIES
   coderay
   database_cleaner
   devise (~> 4.7)
-  doorkeeper (~> 5.4.0)
+  doorkeeper (~> 5.5.0)
   factory_bot_rails
   faker
   jquery-rails