Update to Dokka upstream 1.4.20-dev-22

Change-Id: I99b13c8410dd7cc235aab302ea9a9aeb881442b3
diff --git a/build.gradle.kts b/build.gradle.kts
index 5912552..b3129d8 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -34,7 +34,7 @@
     mainClassName = "org.jetbrains.dokka.MainKt"
 }
 
-val dokkaVersion = "1.4.20-dev-20"
+val dokkaVersion = "1.4.20-dev-22"
 
 dependencies {
     compileOnly(kotlin("stdlib-jdk8"))