Bump org.jetbrains.dokka from 1.9.10 to 1.9.20 (#56)

Bumps [org.jetbrains.dokka](https://github.com/Kotlin/dokka) from 1.9.10 to 1.9.20.
- [Release notes](https://github.com/Kotlin/dokka/releases)
- [Commits](Kotlin/dokka@v1.9.10...v1.9.20)

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

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

gradle/libs.versions.toml

@@ -23,4 +23,4 @@ mingw-ktor-client = { module = "io.ktor:ktor-client-winhttp", version.ref = "kto
 [plugins]
 kotlinMultiplatform = { id = "org.jetbrains.kotlin.multiplatform", version.ref = "kotlin" }
 kotlinSerialization = { id = "org.jetbrains.kotlin.plugin.serialization", version.ref = "kotlin" }
-kotlinDokka = "org.jetbrains.dokka:1.9.10"
+kotlinDokka = "org.jetbrains.dokka:1.9.20"