Maintenance: Update dependency graphql-batch to v0.6.0

Gemfile.lock

@@ -265,7 +265,7 @@ GEM
       activesupport (>= 6.1)
     graphql (2.2.10)
       base64
-    graphql-batch (0.5.4)
+    graphql-batch (0.6.0)
       graphql (>= 1.12.18, < 3)
       promise.rb (~> 0.7.2)
     hashdiff (1.1.0)