Update dependency graphql to v2.3.8

This MR contains the following updates:

Package	Update	Change
graphql (source, changelog)	patch	2.3.5 -> 2.3.8

MR created with the help of gitlab-org/frontend/renovate-gitlab-bot

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Release Notes

rmosolgo/graphql-ruby (graphql)

v2.3.8

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New features

• Input validation: Add all: { ... } validator #​5013
• Visibility: Add Query#types for future type filtering improvements #​4998
• Broadcast: Add default_broadcast(true) option for Connection and Edge types #​5012

Bug fixes

• Remove unused InvalidTypeError #​5003
• Parser: remove unused previous_token and Token #​5015

v2.3.7

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Bug fixes

• Properly merge field directives and resolver directives #​5001

v2.3.6

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New features

• Analysis classes are now in GraphQL::Analysis (GraphQL::Analysis::AST still works, too) #​4996
• Resolvers and Mutations accept directive ... configurations #​4995

Bug fixes

• AsyncDataloader: Copy Fiber-local variables into Async tasks #​4994
• Dataloader: properly batch fetch calls with loads: arguments that call Dataloader sources during .authorized? #​4997

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