Bring back Kotlin version 1.8.10

There is no Dokka plugin `1.8.20` yet

Author: artembilan

build.gradle

@@ -1,5 +1,5 @@
 buildscript {
-    ext.kotlinVersion = '1.8.20'
+    ext.kotlinVersion = '1.8.10'
     ext.isCI = System.getenv('GITHUB_ACTION') || System.getenv('bamboo_buildKey')
     repositories {
         gradlePluginPortal()