Update dependency graphql to v2.2.1

This MR contains the following updates:

Package	Type	Update	Change
graphql (source, changelog)	ironbank-rubygems	minor	2.1.7 -> 2.2.1

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Release Notes

rmosolgo/graphql-ruby (graphql)

v2.2.1

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Bug fixes

• AsyncDataloader: re-raise errors from fields and sources #​4736
• Parser: fix parsing directives on interfaces in SDL #​4738

v2.2.0

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Breaking changes

• loads: now requires a schema's self.resolve_type method to be implemented so that loaded objects can be verified to be of the expected type #​4678
• Tracing: the new Ruby-based parser doesn't emit a "lex" event. (graphql/c_parser still does.)

New features

• GraphQL::Dataloader::AsyncDataloader: a Dataloader class that uses the async gem to run I/O from fields and Dataloader sources in parallel #​4727
• Parser: use a heavily-optimized lexer and a hand-written parser for better performance #​4718
• run_graphql_field: a helper method for running fields in tests #​4732

v2.1.9

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v2.1.8

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New features

• Rails generators: generate a base resolver class by default #​4513
• Dataloader: add some support for transfer-based Fiber schedulers, simplify algorithm #​4625 #​4729
• prepare: check for the named method on the argument owner, too #​4717

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