Update kotlinpoet to v1.15.1

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
com.squareup:kotlinpoet-ksp	1.15.0 -> 1.15.1
com.squareup:kotlinpoet-metadata	1.15.0 -> 1.15.1
com.squareup:kotlinpoet	1.15.0 -> 1.15.1

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Release Notes

square/kotlinpoet (com.squareup:kotlinpoet-ksp)

### [`v1.15.1`](https://togithub.com/square/kotlinpoet/releases/tag/1.15.1) [Compare Source](https://togithub.com/square/kotlinpoet/compare/1.15.0...1.15.1) - Fix: Fix a regression introduced by [#​1637](https://togithub.com/square/kotlinpoet/issues/1637), where a superfluous newline is added to a type's KDoc if it has a primary constructor with no docs ([#​1727](https://togithub.com/square/kotlinpoet/issues/1727)).

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