Bump kotlin from 2.0.0 to 2.0.20 in /android (#158)

Bumps `kotlin` from 2.0.0 to 2.0.20.
Updates `org.jetbrains.kotlin.android` from 2.0.0 to 2.0.20

Updates `org.jetbrains.kotlin.plugin.compose` from 2.0.0 to 2.0.20

Updates `org.jetbrains.kotlin.plugin.serialization` from 2.0.0 to 2.0.20


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android/gradle/libs.versions.toml

@@ -1,6 +1,6 @@
 [versions]
 agp = "8.5.2"
-kotlin = "2.0.0"
+kotlin = "2.0.20"
 ksp = "2.0.20-1.0.25"
 coreKtx = "1.13.1"
 junit = "4.13.2"