Update dependency graphql to v2.2.4

This MR contains the following updates:

Package	Type	Update	Change
graphql (source, changelog)	ironbank-rubygems	patch	2.2.3 -> 2.2.4

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Release Notes

rmosolgo/graphql-ruby (graphql)

v2.2.4

Compare Source

Bug fixes

• AsyncDataloader: don't resolve fields with event loop #​4757
• Parser: properly parse some fields and args named after keywords #​4759
• Performance: use all? to check classes directly #​4760

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