Update to Dokka 2.0.0

Author: whyoleg

gradle.properties

@@ -11,7 +11,7 @@ junit_version=4.12
 junit5_version=5.7.0
 knit_version=0.5.0
 lincheck_version=2.18.1
-dokka_version=1.9.20
+dokka_version=2.0.0
 byte_buddy_version=1.10.9
 reactor_version=3.4.1
 reactor_docs_version=3.4.5