Bump doorkeeper from 5.6.4 to 5.6.5 (#24009)

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Gemfile.lock

@@ -225,7 +225,7 @@ GEM
     docile (1.4.0)
     domain_name (0.5.20190701)
       unf (>= 0.0.5, < 1.0.0)
-    doorkeeper (5.6.4)
+    doorkeeper (5.6.5)
       railties (>= 5)
     dotenv (2.8.1)
     dotenv-rails (2.8.1)