Update dependency graphql to v15.9.0

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
graphql	15.8.0 -> 15.9.0

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Release Notes

graphql/graphql-js (graphql)

### [`v15.9.0`](https://togithub.com/graphql/graphql-js/compare/v15.8.0...511e0f1f1a0f3cbef04f731cf2dd534fb946e0a5) [Compare Source](https://togithub.com/graphql/graphql-js/compare/v15.8.0...v15.9.0)

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Configuration

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