Update dependency org.jetbrains.kotlin:kotlin-gradle-plugin to v1.6.21

| datasource | package                                   | from   | to     |
| ---------- | ----------------------------------------- | ------ | ------ |
| maven      | org.jetbrains.kotlin:kotlin-gradle-plugin | 1.6.20 | 1.6.21 |

Author: renovate-bot

CHANGELOG.md

@@ -14,11 +14,11 @@
 
 ### Updated
 
+- `org.jetbrains.kotlin:kotlin-gradle-plugin -> 1.6.21`
 - `org.jetbrains.kotlinx:binary-compatibility-validator -> 0.9.0`
 - `io.kotest:kotest-assertions-core -> 5.2.3`
 - `org.jetbrains.kotlinx:kotlinx-coroutines-core -> 1.6.1`
 - `gradle -> 7.4.2`
-- `org.jetbrains.kotlin:kotlin-gradle-plugin -> 1.6.20`
 - `com.javiersc.gradle-plugins:all-plugins -> 0.1.0-rc.42`
 
 ## [0.1.0-alpha.4] - 2022-01-07

gradle/pluginLibs.versions.toml

@@ -1,6 +1,6 @@
 [versions]
 javierscGradlePlugins = "0.1.0-rc.42"
-kotlin = "1.6.20"
+kotlin = "1.6.21"
 kotlinBinaryValidator = "0.9.0"
 
 [libraries]