build(deps): bump org.jetbrains.dokka in /watermarker

Bumps [org.jetbrains.dokka](https://github.com/Kotlin/dokka) from 1.9.20 to 2.0.0.
- [Release notes](https://github.com/Kotlin/dokka/releases)
- [Commits](Kotlin/dokka@v1.9.20...v2.0.0)

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

Signed-off-by: dependabot[bot] <[email protected]>

watermarker/build.gradle.kts

@@ -9,7 +9,7 @@ import org.gradle.api.tasks.testing.logging.TestExceptionFormat
 plugins {
     kotlin("multiplatform") version "2.0.21"
     id("maven-publish")
-    id("org.jetbrains.dokka") version "1.9.20"
+    id("org.jetbrains.dokka") version "2.0.0"
     id("org.jlleitschuh.gradle.ktlint") version "12.1.2"
     id("org.jetbrains.kotlinx.kover") version "0.8.3"
 }