Update dependency graphql to v2.2.8

This MR contains the following updates:

Package	Type	Update	Change
graphql (source, changelog)	ironbank-rubygems	patch	2.2.7 -> 2.2.8

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Release Notes

rmosolgo/graphql-ruby (graphql)

v2.2.8

Compare Source

New features

• Responses have "errors" before "data", as recommended by the GraphQL spec #​4823

Bug fixes

• Sentry: fix integration with other trace modules #​4830
• Sentry: fix when child span is nil (test environments) #​4828
• Remove needless Base64 backport #​4820
• Fix module arrangement to support RDoc #​4819

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