Update doorkeeper for:

https://gitlab.com/gitlab-org/gitlab-ce/issues/45433 and https://github.com/doorkeeper-gem/doorkeeper/issues/1065

Update doorkeeper for:
a103cbbe · Lin Jen-Shin · 2e00c1a7 · a103cbbe
--- a/Gemfile.lock
+++ b/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)