fix(deps): update kotlin to v2.1.21 (#124)

Co-authored-by: renovate-self-hosted-apter[bot] <123806997+renovate-self-hosted-apter[bot]@users.noreply.github.com>

Author: renovate-self-hosted-apter[bot]

gradle/libs.versions.toml

@@ -15,7 +15,7 @@ junit4 = "4.13.2"
 junit5 = "5.12.2"
 jvmToolchainMin = "11"
 jvmToolchain = "17"
-kotlin = "2.1.20"
+kotlin = "2.1.21"
 kover = "0.9.1"
 robolectric = "4.14.1"
 robolectricExtensionGradlePlugin = "0.9.0"