Update dependency graphql to v15.7.1

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
graphql	15.7.0 -> 15.7.1

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Release Notes

graphql/graphql-js

### [`v15.7.1`](https://togithub.com/graphql/graphql-js/releases/v15.7.1) [Compare Source](https://togithub.com/graphql/graphql-js/compare/v15.7.0...v15.7.1) #### v15.7.1 (2021-10-27) ##### Bug Fix 🐞 - [#​3341](https://togithub.com/graphql/graphql-js/pull/3341) GraphQLError: revert `originalError` to be nullable ([@​IvanGoncharov](https://togithub.com/IvanGoncharov)) ##### Committers: 1 - Ivan Goncharov([@​IvanGoncharov](https://togithub.com/IvanGoncharov))

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