Bump doorkeeper from 4.4.3 to 5.6.6

Bumps [doorkeeper](https://github.com/doorkeeper-gem/doorkeeper) from 4.4.3 to 5.6.6.
- [Release notes](https://github.com/doorkeeper-gem/doorkeeper/releases)
- [Changelog](https://github.com/doorkeeper-gem/doorkeeper/blob/main/CHANGELOG.md)
- [Upgrade guide](https://github.com/doorkeeper-gem/doorkeeper/blob/main/UPGRADE.md)
- [Commits](doorkeeper-gem/doorkeeper@v4.4.3...v5.6.6)

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

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

Gemfile

@@ -15,7 +15,7 @@ gem 'azure-storage-blob'
 gem 'dalli'
 gem 'deep_cloneable', '~> 3.2.0'
 gem 'devise', '~> 4.7'
-gem 'doorkeeper', '~> 4.4'
+gem 'doorkeeper', '~> 5.6'
 gem 'doorkeeper-jwt', '~> 0.2.1'
 gem 'faraday', '~> 1.10'
 gem 'faraday-http-cache', '~> 2.4'

Gemfile.lock

@@ -138,8 +138,8 @@ GEM
     diff-lcs (1.5.0)
     domain_name (0.5.20190701)
       unf (>= 0.0.5, < 1.0.0)
-    doorkeeper (4.4.3)
-      railties (>= 4.2)
+    doorkeeper (5.6.6)
+      railties (>= 5)
     doorkeeper-jwt (0.2.1)
       jwt (~> 1.5.2, >= 1.5.2)
     erubi (1.12.0)
@@ -354,7 +354,7 @@ GEM
       rack (>= 2.0.0)
     rack-protection (3.0.5)
       rack
-    rack-test (2.0.2)
+    rack-test (2.1.0)
       rack (>= 1.3)
     rails (6.1.7.3)
       actioncable (= 6.1.7.3)
@@ -374,7 +374,7 @@ GEM
     rails-dom-testing (2.0.3)
       activesupport (>= 4.2.0)
       nokogiri (>= 1.6)
-    rails-html-sanitizer (1.4.4)
+    rails-html-sanitizer (1.5.0)
       loofah (~> 2.19, >= 2.19.1)
     railties (6.1.7.3)
       actionpack (= 6.1.7.3)
@@ -535,7 +535,7 @@ DEPENDENCIES
   database_cleaner (~> 1.99.0)
   deep_cloneable (~> 3.2.0)
   devise (~> 4.7)
-  doorkeeper (~> 4.4)
+  doorkeeper (~> 5.6)
   doorkeeper-jwt (~> 0.2.1)
   factory_bot_rails
   faraday (~> 1.10)