Update kotlin monorepo to v2.2.21 (#472)

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

Author: renovate[bot]

gradle/libs.versions.toml

@@ -29,7 +29,7 @@ androidx-test-rules = "1.7.0"
 
 junit-version = "4.13.2"
 
-kotlin = "2.2.20"
+kotlin = "2.2.21"
 agp-version = "7.4.2"
 flank-version = "23.10.1"