Update dependency com.squareup:kotlinpoet to v1.15.3

[juul-mobile-bot]

This PR contains the following updates:

Package	Type	Update	Change
com.squareup:kotlinpoet	dependencies	patch	1.15.2 -> 1.15.3

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Release Notes

square/kotlinpoet (com.squareup:kotlinpoet)

### [`v1.15.3`](https://togithub.com/square/kotlinpoet/releases/tag/1.15.3) [Compare Source](https://togithub.com/square/kotlinpoet/compare/1.15.2...1.15.3) Thanks to [@​gabrielittner](https://togithub.com/gabrielittner) for contributing to this release. - Fix: Fix nullability of lambdas in `KSTypeReference.toTypeName` ([#​1756](https://togithub.com/square/kotlinpoet/issues/1756)).

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Configuration

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♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

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This PR has been generated by Renovate Bot.

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Test Results

  5 files  ±0    5 suites  ±0   22s :stopwatch: ±0s 17 tests ±0  17 :heavy_check_mark: ±0  0 :zzz: ±0  0 :x: ±0  19 runs  ±0  19 :heavy_check_mark: ±0  0 :zzz: ±0  0 :x: ±0 

Results for commit 7c72715b. ± Comparison against base commit 8fd115d1.