Bump com.google.devtools.ksp from 2.0.20-1.0.24 to 2.0.21-1.0.28

Bumps [com.google.devtools.ksp](https://github.com/google/ksp) from 2.0.20-1.0.24 to 2.0.21-1.0.28.
- [Release notes](https://github.com/google/ksp/releases)
- [Commits](google/ksp@2.0.20-1.0.24...2.0.21-1.0.28)

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

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

build.gradle

@@ -5,6 +5,6 @@ plugins {
 
     id 'com.google.gms.google-services' version '4.4.2' apply false
     id 'com.google.firebase.crashlytics' version '3.0.2' apply false
-    id 'com.google.devtools.ksp' version '2.0.20-1.0.24' apply false
+    id 'com.google.devtools.ksp' version '2.0.21-1.0.28' apply false
 }