Update dependency graphql to v15.6.1

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
graphql	15.5.1 -> 15.6.1

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Release Notes

graphql/graphql-js

### [`v15.6.1`](https://togithub.com/graphql/graphql-js/releases/v15.6.1) [Compare Source](https://togithub.com/graphql/graphql-js/compare/v15.6.0...v15.6.1) #### v15.6.1 (2021-10-05) ##### Bug Fix 🐞 - [#​3275](https://togithub.com/graphql/graphql-js/pull/3275) type/introspection: add missing `__Directive.args(includeDeprecated:)` ([@​IvanGoncharov](https://togithub.com/IvanGoncharov)) ##### Committers: 1 - Ivan Goncharov([@​IvanGoncharov](https://togithub.com/IvanGoncharov)) ### [`v15.6.0`](https://togithub.com/graphql/graphql-js/releases/v15.6.0) [Compare Source](https://togithub.com/graphql/graphql-js/compare/v15.5.3...v15.6.0) #### v15.6.0 (2021-09-20) ##### New Feature 🚀 - [#​3267](https://togithub.com/graphql/graphql-js/pull/3267) Depreacate 'VisitorKeyMap' and backported 'ASTVisitorKeyMap' type ([@​IvanGoncharov](https://togithub.com/IvanGoncharov)) ##### Committers: 1 - Ivan Goncharov([@​IvanGoncharov](https://togithub.com/IvanGoncharov)) ### [`v15.5.3`](https://togithub.com/graphql/graphql-js/releases/v15.5.3) [Compare Source](https://togithub.com/graphql/graphql-js/compare/v15.5.2...v15.5.3) #### v15.5.3 (2021-09-06) ##### Bug Fix 🐞 - [#​3254](https://togithub.com/graphql/graphql-js/pull/3254) Parser: fix function definition of parseArguments and parseArgument ([@​n1ru4l](https://togithub.com/n1ru4l)) - [#​3260](https://togithub.com/graphql/graphql-js/pull/3260) backport: Preserve `deprecationReason` on `GraphQLInputField`s ([@​IvanGoncharov](https://togithub.com/IvanGoncharov)) ##### Committers: 2 - Ivan Goncharov([@​IvanGoncharov](https://togithub.com/IvanGoncharov)) - Laurin Quast([@​n1ru4l](https://togithub.com/n1ru4l)) ### [`v15.5.2`](https://togithub.com/graphql/graphql-js/releases/v15.5.2) [Compare Source](https://togithub.com/graphql/graphql-js/compare/v15.5.1...v15.5.2) #### v15.5.2 (2021-08-30) ##### Bug Fix 🐞 - [#​3251](https://togithub.com/graphql/graphql-js/pull/3251) backport parser typescript type-definitions for 15.x.x release ([@​n1ru4l](https://togithub.com/n1ru4l)) ##### Committers: 1 - Laurin Quast([@​n1ru4l](https://togithub.com/n1ru4l))

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