Bump kotlin from 1.9.10 to 1.9.20

Bumps `kotlin` from 1.9.10 to 1.9.20.

Updates `org.jetbrains.kotlin:kotlin-gradle-plugin` from 1.9.10 to 1.9.20
- [Release notes](https://github.com/JetBrains/kotlin/releases)
- [Changelog](https://github.com/JetBrains/kotlin/blob/master/ChangeLog.md)
- [Commits](JetBrains/kotlin@v1.9.10...v1.9.20)

Updates `org.jetbrains.kotlin.android` from 1.9.10 to 1.9.20

Updates `org.jetbrains.kotlin.plugin.serialization` from 1.9.10 to 1.9.20

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

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

gradle/libs.versions.toml

@@ -2,7 +2,7 @@
 # https://developer.android.com/reference/tools/gradle-api
 gradle-plugin = "8.1.2"
 # https://kotlinlang.org/docs/releases.html#release-details
-kotlin = "1.9.10"
+kotlin = "1.9.20"
 # https://central.sonatype.com/artifact/com.google.devtools.ksp/com.google.devtools.ksp.gradle.plugin/versions
 ksp = "1.9.10-1.0.13"
 # https://developer.android.com/jetpack/compose/bom/bom-mapping