Merge pull request #4543 from baomidou/dependabot/gradle/org.jetbrains.kotlin-kotlin-gradle-plugin-1.6.21

Bump kotlin-gradle-plugin from 1.3.72 to 1.6.21

settings.gradle

@@ -8,7 +8,7 @@ buildscript {
 
     dependencies {
         //noinspection DifferentKotlinGradleVersion
-        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:1.3.72"
+        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:1.6.21"
         classpath "gradle.plugin.com.hierynomus.gradle.plugins:license-gradle-plugin:0.16.1"
         classpath "io.freefair.gradle:lombok-plugin:6.4.3"
     }