fix(deps): update dependency conf to v15

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
conf	^12.0.0 -> ^15.0.0

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Release Notes

sindresorhus/conf (conf)

v15.0.2

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• Fix build 6287608

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v15.0.1

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• Fix handling of legacy decryption (#​204) ce28bd6

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v15.0.0

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There are no known breaking changes, but it's a major release since it contains a large refactor, and that introduces risk.

• Add .appendToArray() method a1dbf86
• Fix constructor validation preventing migrations from fixing invalid schema data a1b43e6
• Fix clear() method to emit single change event 9b83a9d
• Fix store setter to preserve internal migration data ceefe13

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v14.0.0

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Breaking

• Require Node.js 20 b8cc931

Improvements

• Add TypeScript type definitions for dot notation property access (#​200) 83cb242

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v13.1.0

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• Add rootSchema and ajvOptions options (#​196) 2819caa
• Add TypeScript overload for .delete() to fix dot-notation typing (#​197) 8fdcdd7

v13.0.1

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• Fix validation being incorrectly run before schema change (#​194) 529e762

v13.0.0

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Breaking

• Switch from JSON Schema draft-v7 to draft-2020-12
  • Please read about the breaking changes.

This is only a breaking change if you use the schema option.

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