build(deps): bump doorkeeper from 5.6.8 to 5.6.9

Bumps [doorkeeper](https://github.com/doorkeeper-gem/doorkeeper) from 5.6.8 to 5.6.9.
- [Release notes](https://github.com/doorkeeper-gem/doorkeeper/releases)
- [Changelog](https://github.com/doorkeeper-gem/doorkeeper/blob/main/CHANGELOG.md)
- [Commits](doorkeeper-gem/doorkeeper@v.5.6.8...v.5.6.9)

---
updated-dependencies:
- dependency-name: doorkeeper
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Gemfile

@@ -60,7 +60,7 @@ gem 'rack-cors'
 # Authentication
 gem 'devise'
 gem 'omniauth-mlh', '~> 0.4.2'
-gem 'doorkeeper', '~> 5.5'
+gem 'doorkeeper', '~> 5.6'
 gem 'devise-doorkeeper'
 gem 'omniauth-rails_csrf_protection'
 

Gemfile.lock

@@ -156,7 +156,7 @@ GEM
       doorkeeper
       rails
     docile (1.1.5)
-    doorkeeper (5.6.8)
+    doorkeeper (5.6.9)
       railties (>= 5)
     dotenv (2.8.1)
     dotenv-rails (2.8.1)
@@ -546,7 +546,7 @@ DEPENDENCIES
   codeclimate-test-reporter (~> 1.0.7)
   devise
   devise-doorkeeper
-  doorkeeper (~> 5.5)
+  doorkeeper (~> 5.6)
   dotenv-rails
   factory_bot_rails (~> 6.4.3)
   faker