Bump dokka-maven-plugin from 1.6.21 to 1.7.20 (#3409)

Bumps [dokka-maven-plugin](https://github.com/Kotlin/dokka) from 1.6.21 to 1.7.20.
- [Release notes](https://github.com/Kotlin/dokka/releases)
- [Commits](Kotlin/dokka@v1.6.21...v1.7.20)

---
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] <support@github.com>

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

pom.xml

@@ -71,7 +71,7 @@
     <jmh.version>1.35</jmh.version>
     <hamcrest.veresion>2.2</hamcrest.veresion>
     <kotlin.version>1.7.20</kotlin.version>
-    <dokka.version>1.6.21</dokka.version>
+    <dokka.version>1.7.20</dokka.version>
 
     <!-- Import-Package definitions for maven-bundle-plugin -->
     <osgi.import.package.root>