Update Dokka to 1.9.20 (#2591)

Author: whyoleg

gradle.properties

@@ -13,7 +13,7 @@ kotlin.version.snapshot=2.0.255-SNAPSHOT
 
 junit_version=4.12
 jackson_version=2.10.0.pr1
-dokka_version=1.9.10
+dokka_version=1.9.20
 native.deploy=
 validator_version=0.13.2
 knit_version=0.5.0