Update dependency graphql to v2.3.5

This MR contains the following updates:

Package	Type	Update	Change
graphql (source, changelog)	ironbank-rubygems	patch	2.3.4 -> 2.3.5

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Release Notes

rmosolgo/graphql-ruby (graphql)

v2.3.5

Compare Source

Breaking changes

• Remove default load_* implementations in arguments -- this could break calls to super if you have redefined this method in subclasses #​4978

Bug fixes

• Enums: fix parsing enum values that match GraphQL keywords (eg type, extend) #​4987
• Consolidate runtime state #​4969
• Simplify schema type indexes #​4971 #​4986
• Remove duplicate when clause #​4976
• Address many Ruby warnings #​4978
• Remove needless ruby2_keywords usage #​4989
• Fix some YARD docs #​4984

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