Update dependency graphql to v2.3.15

This MR contains the following updates:

Package	Update	Change
graphql (source, changelog)	patch	2.3.14 -> 2.3.15

MR created with the help of gitlab-org/frontend/renovate-gitlab-bot

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Release Notes

rmosolgo/graphql-ruby (graphql)

v2.3.15

Compare Source

New features

• Type definitions accept comment("...") for annotating SDL #​5067
• Parser: add tokens_count method #​5066
• Schema: allow validate_timeout to be reset #​5062

Bug fixes

• Optimize Language.escape_single_quoted_newlines #​5095
• Generators: Add # frozen_string_literal: true to base resolver #​5092
• Parser: Properly handle minus followed by name #​5090
• Migrate some attr_reader methods #​5080
• Handle variable definition directives #​5072
• Handle GraphQL::ExecutionError when loading arguments during analysis #​5071
• NotificationsTrace: properly call super
• Use symbols for namespaced_types generator option #​5068
• Reduce memory usage in lazy resolution #​5061
• Fix default trace inheritance #​5045

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