Upgrade grahpql gem to 1.11.8

Main purpose of this upgrade is Ruby 3.0 support.

Gemfile

@@ -89,7 +89,7 @@ gem 'grape-entity', '~> 0.7.1'
 gem 'rack-cors', '~> 1.0.6', require: 'rack/cors'
 
 # GraphQL API
-gem 'graphql', '~> 1.11.4'
+gem 'graphql', '~> 1.11.8'
 # NOTE: graphiql-rails v1.5+ doesn't work: https://gitlab.com/gitlab-org/gitlab/issues/31771
 # TODO: remove app/views/graphiql/rails/editors/show.html.erb when https://github.com/rmosolgo/graphiql-rails/pull/71 is released:
 # https://gitlab.com/gitlab-org/gitlab/issues/31747

Gemfile.lock

@@ -520,7 +520,7 @@ GEM
       faraday (>= 1.0)
       faraday_middleware
       graphql-client
-    graphql (1.11.4)
+    graphql (1.11.8)
     graphql-client (0.16.0)
       activesupport (>= 3.0)
       graphql (~> 1.8)
@@ -1393,7 +1393,7 @@ DEPENDENCIES
   grape_logging (~> 1.7)
   graphiql-rails (~> 1.4.10)
   graphlient (~> 0.4.0)
-  graphql (~> 1.11.4)
+  graphql (~> 1.11.8)
   graphql-docs (~> 1.6.0)
   grpc (~> 1.30.2)
   gssapi