Bump org.jetbrains.dokka from 1.9.10 to 1.9.20 (#231)

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>

turtle/build.gradle.kts

@@ -4,7 +4,7 @@ import java.net.URL
 
 plugins {
     kotlin("jvm")
-    id("org.jetbrains.dokka") version "1.9.10"
+    id("org.jetbrains.dokka") version "1.9.20"
     id("com.vanniktech.maven.publish") version "0.28.0"
 }