Bump kotlin from 1.9.10 to 1.9.21

Bumps `kotlin` from 1.9.10 to 1.9.21.

Updates `org.jetbrains.kotlin:kotlin-gradle-plugin` from 1.9.10 to 1.9.21
- [Release notes](https://github.com/JetBrains/kotlin/releases)
- [Changelog](https://github.com/JetBrains/kotlin/blob/master/ChangeLog.md)
- [Commits](JetBrains/kotlin@v1.9.10...v1.9.21)

Updates `org.jetbrains.kotlin.jvm` from 1.9.10 to 1.9.21
- [Release notes](https://github.com/JetBrains/kotlin/releases)
- [Changelog](https://github.com/JetBrains/kotlin/blob/master/ChangeLog.md)
- [Commits](JetBrains/kotlin@v1.9.10...v1.9.21)

---
updated-dependencies:
- dependency-name: org.jetbrains.kotlin:kotlin-gradle-plugin
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: org.jetbrains.kotlin.jvm
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

gradle/libs.versions.toml

@@ -29,7 +29,7 @@ viewModelLifecycle = "1.1.0"
 hilt = "2.48.1"
 hiltWorker = "1.0.0"
 junit4 = "4.13.2"
-kotlin = "1.9.10"
+kotlin = "1.9.21"
 kotlinxCoroutines = "1.7.3"
 ksp = "1.9.20-1.0.14"
 ktlint = "0.43.0"