Bump version_kotlin from 1.9.10 to 1.9.20

Bumps `version_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:kotlin-serialization` 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:kotlin-stdlib-jdk8` 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)

---
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:kotlin-serialization
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: org.jetbrains.kotlin:kotlin-stdlib-jdk8
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

build.gradle

@@ -23,7 +23,7 @@ buildscript {
         version_coroutine = "1.7.3"
         version_appcompat = "1.6.1"
         version_gradle = '8.1.4'
-        version_kotlin = "1.9.10"
+        version_kotlin = "1.9.20"
         version_room = "2.6.0"
         version_work = "2.8.1"
         version_billing = "6.1.0"