Update dependency graphql to v2.2.7

This MR contains the following updates:

Package	Type	Update	Change
graphql (source, changelog)	ironbank-rubygems	patch	2.2.6 -> 2.2.7

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Release Notes

rmosolgo/graphql-ruby (graphql)

v2.2.7

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Deprecations

• Deprecate returning .resolve dataloader requests (use .load instead) #​4807
• Deprecate error_bubbling(true), no replacement. Please open an issue if you need this option. #​4813

Bug fixes

• Remove unused racc dependency #​4814
• Fix backtrace: true when used with @defer and batch-loaded lists #​4815
• Accept input objects when required arguments aren't provided but have default values #​4811

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