fix(deps): update kotlin monorepo to v2.3.21 (#432)

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

Author: renovate[bot]

gradle/libs.versions.toml

@@ -13,7 +13,7 @@ androidx-sqlite = "2.6.2"
 androidx-test-ext = "1.3.0"
 
 jetbrains-dokka = "2.2.0"
-jetbrains-kotlin = "2.3.20"
+jetbrains-kotlin = "2.3.21"
 
 io-mockk = "1.14.9"