Update dependency doorkeeper-openid_connect to v1.9.0

Author: renovate[bot]

Gemfile.lock

@@ -250,8 +250,8 @@ GEM
       railties (>= 5)
     doorkeeper-jwt (0.4.2)
       jwt (>= 2.1)
-    doorkeeper-openid_connect (1.8.11)
-      doorkeeper (>= 5.5, < 5.9)
+    doorkeeper-openid_connect (1.9.0)
+      doorkeeper (>= 5.5, < 6.0)
       jwt (>= 2.5)
       ostruct (>= 0.5)
     dotenv (3.2.0)