Update plugin com.google.devtools.ksp to v2.0.21-1.0.25

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
com.google.devtools.ksp (source)	2.0.20-1.0.25 -> 2.0.21-1.0.25

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Release Notes

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

### [`v2.0.21-1.0.25`](https://redirect.github.com/google/ksp/releases/tag/2.0.21-1.0.25) [Compare Source](https://redirect.github.com/google/ksp/compare/2.0.20-1.0.25...2.0.21-1.0.25) #### What's Changed - UPDATE_KOTLIN_VERSION: 2.0.21 by [@​ting-yuan](https://redirect.github.com/ting-yuan) in [https://github.com/google/ksp/pull/2145](https://redirect.github.com/google/ksp/pull/2145) **Full Changelog**: https://github.com/google/ksp/compare/2.0.21-RC-1.0.25...2.0.21-1.0.25

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Configuration

📅 Schedule: Branch creation - "before 4am" (UTC), Automerge - At any time (no schedule defined).

🚦 Automerge: Enabled.

♻ Rebasing: Whenever PR becomes conflicted, 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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