Merge branch '45433-upgrade-doorkeeper' into 'master'

Update doorkeeper

Closes #45433 and #45647

See merge request gitlab-org/gitlab-ce!18543

Gemfile.lock

@@ -178,7 +178,7 @@ GEM
     docile (1.1.5)
     domain_name (0.5.20170404)
       unf (>= 0.0.5, < 1.0.0)
-    doorkeeper (4.3.1)
+    doorkeeper (4.3.2)
       railties (>= 4.2)
     doorkeeper-openid_connect (1.3.0)
       doorkeeper (~> 4.3)