Update kotlin monorepo to v2.1.20 (#107)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

gradle/libs.versions.toml

@@ -6,7 +6,7 @@ android-version-versionName = "1.1.1"
 
 agp = "8.9.1"
 androidTools = "31.9.1"
-kotlin = "2.1.10"
+kotlin = "2.1.20"
 kotlinx-coroutines = "1.10.2"
 kotlinx-serialization = "1.8.1"
 kotlinx-kover = "0.9.1"