deps android: Upgrade Kotlin to 2.1.20, from 2.0.10

Release notes:
  https://kotlinlang.org/docs/whatsnew2020.html
  https://kotlinlang.org/docs/whatsnew21.html
  https://kotlinlang.org/docs/whatsnew2120.html

Highlights:

* 2.0.20
  - Standard library; Support for UUIDs.
  - Otherwise mostly related to Wasm, Native and Kotlin
    Multiplatform.

* 2.1.0
  - K2; Extra compiler checks.
  - Otherwise mostly related to Wasm, Native and Kotlin
    Multiplatform.

* 2.1.20
  - Mostly new experimental features.

Author: rajveermalviya

android/gradle.properties

@@ -13,4 +13,4 @@ agpVersion=8.5.2
 #   https://kotlinlang.org/docs/releases.html#release-details
 # A helpful discussion is at:
 #   https://stackoverflow.com/a/74425347
-kotlinVersion=2.0.10
+kotlinVersion=2.1.20