Bump doorkeeper from 5.1.0 to 5.2.0 (#11856)

Bumps [doorkeeper](https://github.com/doorkeeper-gem/doorkeeper) from 5.1.0 to 5.2.0.
- [Release notes](https://github.com/doorkeeper-gem/doorkeeper/releases)
- [Changelog](https://github.com/doorkeeper-gem/doorkeeper/blob/master/CHANGELOG.md)
- [Commits](https://github.com/doorkeeper-gem/doorkeeper/compare/v5.1.0...v5.2.0)

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

Gemfile

@@ -44,7 +44,7 @@ gem 'omniauth-saml', '~> 1.10'
 gem 'omniauth', '~> 1.9'
 
 gem 'discard', '~> 1.1'
-gem 'doorkeeper', '~> 5.1'
+gem 'doorkeeper', '~> 5.2'
 gem 'fast_blank', '~> 1.0'
 gem 'fastimage'
 gem 'goldfinger', '~> 2.1'

Gemfile.lock

@@ -209,7 +209,7 @@ GEM
     docile (1.3.2)
     domain_name (0.5.20180417)
       unf (>= 0.0.5, < 1.0.0)
-    doorkeeper (5.1.0)
+    doorkeeper (5.2.0)
       railties (>= 5)
     dotenv (2.7.5)
     dotenv-rails (2.7.5)
@@ -697,7 +697,7 @@ DEPENDENCIES
   devise-two-factor (~> 3.1)
   devise_pam_authenticatable2 (~> 9.2)
   discard (~> 1.1)
-  doorkeeper (~> 5.1)
+  doorkeeper (~> 5.2)
   dotenv-rails (~> 2.7)
   fabrication (~> 2.20)
   faker (~> 2.3)