Update graphql to version 2.3.21

Author: depfu[bot]

Gemfile.lock

@@ -143,15 +143,17 @@ GEM
       net-http
     ffaker (2.23.0)
     ffi (1.15.5)
+    fiber-storage (1.0.0)
     figaro (1.2.0)
       thor (>= 0.14.0, < 2)
     globalid (1.2.1)
       activesupport (>= 6.1)
     graphiql-rails (1.9.0)
       railties
       sprockets-rails
-    graphql (2.3.4)
+    graphql (2.3.21)
       base64
+      fiber-storage
     hashdiff (1.0.1)
     hashie (5.0.0)
     http-accept (1.7.0)