chore(deps): update dependency graphql to v15.3.0

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
graphql	devDependencies	minor	15.2.0 -> 15.3.0

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Release Notes

graphql/graphql-js

### [`v15.3.0`](https://togithub.com/graphql/graphql-js/releases/v15.3.0) [Compare Source](https://togithub.com/graphql/graphql-js/compare/v15.2.0...v15.3.0) #### v15.3.0 (2020-07-05) ##### New Feature 🚀 - [#​2688](https://togithub.com/graphql/graphql-js/pull/2688) Added new 'FormattedExecutionResult' type ([@​IvanGoncharov](https://togithub.com/IvanGoncharov)) ##### Docs 📝

3 PRs were merged

- [#​2680](https://togithub.com/graphql/graphql-js/pull/2680) Docs: some language cleanup in readme and API reference ([@​rmcteggart-r7](https://togithub.com/rmcteggart-r7)) - [#​2681](https://togithub.com/graphql/graphql-js/pull/2681) Sync JSDoc comments with docs changes ([@​danielrearden](https://togithub.com/danielrearden)) - [#​2687](https://togithub.com/graphql/graphql-js/pull/2687) Make documentation for 'getFieldDef' more accurate ([@​Cito](https://togithub.com/Cito))

##### Polish 💅

2 PRs were merged

- [#​2679](https://togithub.com/graphql/graphql-js/pull/2679) mapAsyncIterator-test: replace 'invariant' with expect chains ([@​IvanGoncharov](https://togithub.com/IvanGoncharov)) - [#​2686](https://togithub.com/graphql/graphql-js/pull/2686) ESLint: remove 'ts-lint' commits ([@​IvanGoncharov](https://togithub.com/IvanGoncharov))

##### Internal 🏠 - [#​2685](https://togithub.com/graphql/graphql-js/pull/2685) workflows: check commit for ignored files ([@​IvanGoncharov](https://togithub.com/IvanGoncharov)) ##### Dependency 📦

2 PRs were merged

- [#​2678](https://togithub.com/graphql/graphql-js/pull/2678) Update deps ([@​IvanGoncharov](https://togithub.com/IvanGoncharov)) - [#​2683](https://togithub.com/graphql/graphql-js/pull/2683) Update deps ([@​IvanGoncharov](https://togithub.com/IvanGoncharov))

##### Committers: 4 - Christoph Zwerschke([@​Cito](https://togithub.com/Cito)) - Daniel Rearden([@​danielrearden](https://togithub.com/danielrearden)) - Ivan Goncharov([@​IvanGoncharov](https://togithub.com/IvanGoncharov)) - [@​rmcteggart-r7](https://togithub.com/rmcteggart-r7)

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