Update dependency webonyx/graphql-php to v15.8.1 (dev)

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
webonyx/graphql-php	15.8.0 -> 15.8.1

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Release Notes

webonyx/graphql-php (webonyx/graphql-php)

### [`v15.8.1`](https://togithub.com/webonyx/graphql-php/blob/HEAD/CHANGELOG.md#v1581) [Compare Source](https://togithub.com/webonyx/graphql-php/compare/v15.8.0...v15.8.1) ##### Fixed - Correctly print deprecated argument with default value [https://github.com/webonyx/graphql-php/pull/1491](https://togithub.com/webonyx/graphql-php/pull/1491)

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Configuration

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