Bump com.google.devtools.ksp in the kotlin group

Bumps the kotlin group with 1 update: [com.google.devtools.ksp](https://github.com/google/ksp).


Updates `com.google.devtools.ksp` from 2.0.21-1.0.27 to 2.0.21-1.0.28
- [Release notes](https://github.com/google/ksp/releases)
- [Commits](google/ksp@2.0.21-1.0.27...2.0.21-1.0.28)

---
updated-dependencies:
- dependency-name: com.google.devtools.ksp
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: kotlin
...

Signed-off-by: dependabot[bot] <[email protected]>

gradle/libs.versions.toml

@@ -7,7 +7,7 @@ autoservice-annotations = { module = "com.google.auto.service:auto-service-annot
 autoservice-ksp = { module = "dev.zacsweers.autoservice:auto-service-ksp", version = "1.2.0" }
 
 [plugins]
-kotlin-ksp = { id = "com.google.devtools.ksp", version = "2.0.21-1.0.27" }
+kotlin-ksp = { id = "com.google.devtools.ksp", version = "2.0.21-1.0.28" }
 kotlin-jvm = { id = "org.jetbrains.kotlin.jvm", version.ref = "kotlin" }
 kotlin-samReceiver = { id = "org.jetbrains.kotlin.plugin.sam.with.receiver", version.ref = "kotlin" }
 gradle-pluginPublish = { id = "com.gradle.plugin-publish", version = "1.3.0" }