Bump org.jetbrains.dokka:dokka-gradle-plugin from 1.8.10 to 1.8.20 (#238

)

Bumps [org.jetbrains.dokka:dokka-gradle-plugin](https://github.com/Kotlin/dokka) from 1.8.10 to 1.8.20.
- [Release notes](https://github.com/Kotlin/dokka/releases)
- [Commits](Kotlin/dokka@v1.8.10...v1.8.20)

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

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

gradle/libs.versions.toml

@@ -14,7 +14,7 @@ kotlinx-binaryCompatibilityValidator = "org.jetbrains.kotlinx.binary-compatibili
 kotlin-test-junit = { module = "org.jetbrains.kotlin:kotlin-test-junit", version.ref = "kotlin" }
 kotlin-gradlePlugin = { module = "org.jetbrains.kotlin:kotlin-gradle-plugin", version.ref = "kotlin" }
 
-dokka-gradlePlugin = "org.jetbrains.dokka:dokka-gradle-plugin:1.8.10"
+dokka-gradlePlugin = "org.jetbrains.dokka:dokka-gradle-plugin:1.8.20"
 
 auto-common = "com.google.auto:auto-common:1.2.1"