Update kotlin monorepo to v2.2.20-Beta2 (#2517)

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

gradle/libs.versions.toml

@@ -18,7 +18,7 @@ coil = "3.3.0"
 compose-bom = "2025.07.00"
 compose-destinations = "2.2.0"
 compose-preference = "2.1.0"
-kotlin = "2.2.20-Beta1"
+kotlin = "2.2.20-Beta2"
 kotlinx-coroutines = "1.10.2"
 kotlinx-datetime = "0.7.1"
 kotlinx-serialization = "1.9.0"