Update plugin com.google.devtools.ksp to v2.0.21-1.0.28

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
com.google.devtools.ksp (source)	2.0.21-1.0.27 -> 2.0.21-1.0.28

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Release Notes

google/ksp (com.google.devtools.ksp)

### [`v2.0.21-1.0.28`](https://redirect.github.com/google/ksp/releases/tag/2.0.21-1.0.28) #### Updates - \[KSP2] Running from command line never finishes [#​2176](https://redirect.github.com/google/ksp/issues/2176) - Introduce KspAATask.commandLineArgumentProviders [#​2201](https://redirect.github.com/google/ksp/issues/2201) #### Contributors Thanks to [@​GeorgCantor](https://redirect.github.com/GeorgCantor) and everyone who reported bugs and participated in discussions!

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Configuration

📅 Schedule: Branch creation - "every weekend" (UTC), Automerge - At any time (no schedule defined).

🚦 Automerge: Enabled.

♻ Rebasing: Whenever PR is behind base branch, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

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• [ ] If you want to rebase/retry this PR, check this box

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