Update dependency conf to v13

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
conf	^12 -> ^13.0.0

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Release Notes

sindresorhus/conf (conf)

### [`v13.0.0`](https://togithub.com/sindresorhus/conf/releases/tag/v13.0.0) [Compare Source](https://togithub.com/sindresorhus/conf/compare/v12.0.0...v13.0.0) ##### Breaking - Switch from JSON Schema draft-v7 to [draft-2020-12](https://json-schema.org/draft/2020-12/release-notes#2020-12-release-notes) - Please [read about](https://ajv.js.org/json-schema.html#draft-2020-12) the breaking changes. *This is only a breaking change if you use the `schema` option.*

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Configuration

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