Update plugin dokka to v2.1.0 (#78)

This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| org.jetbrains.dokka | `2.0.0` -> `2.1.0` |
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|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/maven/org.jetbrains.dokka:org.jetbrains.dokka.gradle.plugin/2.1.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/maven/org.jetbrains.dokka:org.jetbrains.dokka.gradle.plugin/2.0.0/2.1.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/maven/org.jetbrains.dokka:org.jetbrains.dokka.gradle.plugin/2.0.0/2.1.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
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gradle/libs.versions.toml

@@ -2,7 +2,7 @@
 kotlin = "2.2.20"
 
 [plugins]
-dokka = { id = "org.jetbrains.dokka", version = "2.0.0" }
+dokka = { id = "org.jetbrains.dokka", version = "2.1.0" }
 kotlin-jvm = { id = "org.jetbrains.kotlin.jvm", version.ref = "kotlin" }
 kotlinx-serialization = { id = "org.jetbrains.kotlin.plugin.serialization", version.ref = "kotlin" }
 spotless = { id = "com.diffplug.spotless", version = "7.2.1" }