Update ksp to v2.0.21-1.0.25 (#1029)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [com.google.devtools.ksp](https://goo.gle/ksp)
([source](https://redirect.github.com/google/ksp)) | plugin | patch |
`2.0.20-1.0.25` -> `2.0.21-1.0.25` |
|
[com.google.devtools.ksp:symbol-processing-gradle-plugin](https://goo.gle/ksp)
([source](https://redirect.github.com/google/ksp)) | dependencies |
patch | `2.0.20-1.0.25` -> `2.0.21-1.0.25` |

---

### Release Notes

<details>
<summary>google/ksp (com.google.devtools.ksp)</summary>

###
[`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
[@&#8203;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**:
google/ksp@2.0.21-RC-1.0.25...2.0.21-1.0.25

</details>

---

### Configuration

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rebase/retry checkbox.

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---

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---

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Co-authored-by: Zac Sweers <[email protected]>

gradle/libs.versions.toml

@@ -26,7 +26,7 @@ jna = "5.15.0"
 kaml = "0.61.0"
 kotlin = "2.0.20"
 kotlinx-serialization = "1.7.3"
-ksp = "2.0.20-1.0.25"
+ksp = "2.0.21-1.0.25"
 kotlinPoet = "1.18.1"
 ktfmt = "0.52"
 markdown = "0.26.0"