Bump dokka-gradle-plugin from 1.5.31 to 1.6.0 (#4407)

Bumps dokka-gradle-plugin from 1.5.31 to 1.6.0.

---
updated-dependencies:
- dependency-name: org.jetbrains.dokka:dokka-gradle-plugin
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

build.gradle

@@ -3,7 +3,7 @@ import java.time.Duration
 // Top-level build file where you can add configuration options common to all sub-projects/modules.
 buildscript {
     ext.kotlinVersion = '1.5.31'
-    ext.dokkaVersion = '1.5.31'
+    ext.dokkaVersion = '1.6.0'
 
     repositories {
         mavenCentral()