Upgrade to Kotlin 1.6.0, Gradle 7.3

build.gradle

@@ -14,7 +14,7 @@ plugins {
     // remember to update all the versions here when upgrading kotlin version
     id 'org.jetbrains.kotlin.jvm' apply false
     id 'org.jetbrains.kotlin.multiplatform'  apply false
-    id 'org.jetbrains.kotlin.plugin.serialization' version '1.5.31' apply false
+    id 'org.jetbrains.kotlin.plugin.serialization' version '1.6.0' apply false
 }
 
 def multiplatformModules = [
@@ -35,11 +35,11 @@ def multiplatformModules = [
 ]
 
 project.ext {
-    kotlinApiVersion = '1.4'
-    kotlinLanguageVersion = '1.4'
-    kotlinVersion = '1.5.31'
+    kotlinApiVersion = '1.6'
+    kotlinLanguageVersion = '1.6'
+    kotlinVersion = '1.6.0'
     kotlinLoggingVersion = '2.0.8'
-    kotlinxSerializationVersion = '1.3.0-RC'
+    kotlinxSerializationVersion = '1.3.1'
     spekVersion = '2.0.15'
     kluentVersion = '1.65'
     jsoupVersion = '1.13.1'
@@ -56,7 +56,7 @@ ext.isReleaseVersion = !version.endsWith("SNAPSHOT")
 project.ext {
     openrndrVersion = openrndrUseSnapshot? "0.5.1-SNAPSHOT" : "0.4.0"
     jvmTarget = "1.8"
-    kotlinVersion = "1.5.31"
+    kotlinVersion = "1.6.0"
     kotlinApiVersion = "1.4"
     spekVersion = "2.0.15"
     libfreenectVersion = "0.5.7-1.5.4"