Bump org.jetbrains.dokka:dokka-maven-plugin from 1.7.20 to 1.9.20

Bumps [org.jetbrains.dokka:dokka-maven-plugin](https://github.com/Kotlin/dokka) from 1.7.20 to 1.9.20.
- [Release notes](https://github.com/Kotlin/dokka/releases)
- [Commits](Kotlin/dokka@v1.7.20...v1.9.20)

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

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

Author: dependabot[bot]

kotlin-libraries-2/pom.xml

@@ -308,7 +308,7 @@
         <kotlinx-cli-jvm.version>0.3.6</kotlinx-cli-jvm.version>
         <moshi.version>1.14.0</moshi.version>
         <maven-compiler-plugin.version>3.10.1</maven-compiler-plugin.version>
-        <dokka-maven-plugin.version>1.7.20</dokka-maven-plugin.version>
+        <dokka-maven-plugin.version>1.9.20</dokka-maven-plugin.version>
         <os-maven-plugin.version>1.7.0</os-maven-plugin.version>
         <protobuf-maven-plugin.version>0.6.1</protobuf-maven-plugin.version>
     </properties>