chore(deps): bump kotlin from 2.3.10 to 2.3.21

Bumps `kotlin` from 2.3.10 to 2.3.21.

Updates `org.jetbrains.kotlin:kotlin-stdlib-jdk7` from 2.3.10 to 2.3.21
- [Changelog](https://github.com/JetBrains/kotlin/blob/master/ChangeLog.md)
- [Commits](JetBrains/kotlin@v2.3.10...v2.3.21)

Updates `org.jetbrains.kotlin:kotlin-gradle-plugin` from 2.3.10 to 2.3.21
- [Changelog](https://github.com/JetBrains/kotlin/blob/master/ChangeLog.md)
- [Commits](JetBrains/kotlin@v2.3.10...v2.3.21)

Updates `org.jetbrains.kotlin.plugin.compose` from 2.3.10 to 2.3.21
- [Changelog](https://github.com/JetBrains/kotlin/blob/master/ChangeLog.md)
- [Commits](JetBrains/kotlin@v2.3.10...v2.3.21)

Updates `org.jetbrains.kotlin.android` from 2.3.10 to 2.3.21
- [Changelog](https://github.com/JetBrains/kotlin/blob/master/ChangeLog.md)
- [Commits](JetBrains/kotlin@v2.3.10...v2.3.21)

---
updated-dependencies:
- dependency-name: org.jetbrains.kotlin:kotlin-stdlib-jdk7
  dependency-version: 2.3.21
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: org.jetbrains.kotlin:kotlin-gradle-plugin
  dependency-version: 2.3.21
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: org.jetbrains.kotlin.plugin.compose
  dependency-version: 2.3.21
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: org.jetbrains.kotlin.android
  dependency-version: 2.3.21
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

gradle/libs.versions.toml

@@ -10,7 +10,7 @@ androidTargetSdk = "36"
 agp = "9.1.0"
 dokka = "2.1.0"
 gradleMavenPublishPlugin = "0.36.0"
-kotlin = "2.3.10"
+kotlin = "2.3.21"
 kotlinxCoroutines = "1.10.2"
 
 # Android