Bump jetbrainsKotlinVersion from 2.0.20 to 2.0.21

Bumps `jetbrainsKotlinVersion` from 2.0.20 to 2.0.21.

Updates `org.jetbrains.kotlin.android` from 2.0.20 to 2.0.21
- [Release notes](https://github.com/JetBrains/kotlin/releases)
- [Changelog](https://github.com/JetBrains/kotlin/blob/v2.0.21/ChangeLog.md)
- [Commits](JetBrains/kotlin@v2.0.20...v2.0.21)

Updates `org.jetbrains.kotlin.plugin.compose` from 2.0.20 to 2.0.21
- [Release notes](https://github.com/JetBrains/kotlin/releases)
- [Changelog](https://github.com/JetBrains/kotlin/blob/v2.0.21/ChangeLog.md)
- [Commits](JetBrains/kotlin@v2.0.20...v2.0.21)

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

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

gradle/libs.versions.toml

@@ -5,7 +5,7 @@ androidxComposeCompilerVersion = "1.5.15"
 androidxCoreKtxVersion = "1.13.1"
 browserVersion = "1.8.0"
 coilComposeVersion = "2.7.0"
-jetbrainsKotlinVersion = "2.0.20"
+jetbrainsKotlinVersion = "2.0.21"
 kotlinxCoroutinesAndroidVersion = "1.9.0"
 optoVersion = "1.1.0"
 androidxDataStoreVersion = "1.1.1"