build: update dependency json-schema-to-typescript to v8

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
json-schema-to-typescript	devDependencies	major	^7.0.0 -> ^8.0.0

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Release Notes

bcherny/json-schema-to-typescript

### [`v8.0.0`](https://togithub.com/bcherny/json-schema-to-typescript/blob/master/CHANGELOG.md#​800) - [`e144890`](https://togithub.com/bcherny/json-schema-to-typescript/commit/e144890) Improve generated output when mixing nulls and unions ([#​261](https://togithub.com/bcherny/json-schema-to-typescript/issues/261))

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