Remove orphaned service_bindings routes (#4948)

The V3 ServiceBindingsController was removed in commit 57357b4
(Feb 2021) when it was replaced by service_credential_bindings,
but the routes were accidentally left behind.

These orphaned routes cause 500 errors with "uninitialized constant
ServiceBindingsController" during route resolution.

Author: philippthun

config/routes.rb

@@ -186,12 +186,6 @@
   delete '/security_groups/:guid/relationships/staging_spaces/:space_guid', to: 'security_groups#delete_staging_spaces'
   delete '/security_groups/:guid', to: 'security_groups#destroy'
 
-  # service_bindings
-  post '/service_bindings', to: 'service_bindings#create'
-  get '/service_bindings/:guid', to: 'service_bindings#show'
-  get '/service_bindings', to: 'service_bindings#index'
-  delete '/service_bindings/:guid', to: 'service_bindings#destroy'
-
   # service_credential_bindings
   resources :service_credential_bindings,
             param: :guid,