[ruby/grape] Disable logging (#9744)

+---------------------+-----+-----+-----+------+---------+--------------+
|          branch_name| json|   db|query|update|plaintext|weighted_score|
+---------------------+-----+-----+-----+------+---------+--------------+
|               master|51735|23291|14725|  9348|    22430|          1055|
|grape/disable-logging|52475|26622|14651| 10162|    22814|          1115|
+---------------------+-----+-----+-----+------+---------+--------------+

frameworks/Ruby/grape/config.ru

@@ -35,6 +35,7 @@ module Acme
   end
 
   class DatabaseQueries < Grape::API
+    logger nil
     helpers do
       def bounded_queries
         queries = params[:queries].to_i
@@ -80,6 +81,7 @@ module Acme
       header 'Date', Time.now.httpdate if defined?(Puma)
       header 'Server', 'WebServer'
     end
+    logger nil
     content_type :json, 'application/json'
     format :json