Update dependency org.jetbrains.kotlin:kotlin-gradle-plugin to v1.7.21

Author: renovate[bot]

gradle/libs.versions.toml

@@ -11,7 +11,7 @@ gradlePlugins-moduleGraphAssertion = "2.2.0"
 gradlePlugins-paparazzi = "1.0.0"
 gradlePlugins-ruler = "1.4.0"
 gradlePlugins-versionUpdate = "0.42.0"
-kotlin = "1.7.10"
+kotlin = "1.7.21"
 ksp = "1.7.10-1.0.6"
 mixpanel-java = "1.5.1"
 moshi-kotlin = "1.13.0"