Fix unknown constant in compliance dashboard seed

The following error was encountered when seeding
`ee/db/fixtures/development/32_compliance_dashboard_merge_requests.rb`:

```
NameError: uninitialized constant
Gitlab::Seeder::ComplianceDashboardMergeRequests::AccessDeniedError
```

ee/db/fixtures/development/32_compliance_dashboard_merge_requests.rb

@@ -66,8 +66,8 @@ class Gitlab::Seeder::ComplianceDashboardMergeRequests
 
       merge_request
     end
-  rescue AccessDeniedError
-    raise AccessDeniedError.new("If you are re-creating your GitLab database, you should also delete your old repositories located at $GDK/repositories/@hashed")
+  rescue ::Gitlab::Access::AccessDeniedError
+    raise ::Gitlab::Access::AccessDeniedError.new("If you are re-creating your GitLab database, you should also delete your old repositories located at $GDK/repositories/@hashed")
   end
 
   def create_pipeline!(project, ref, commit, status)