Bump org.apache.maven.plugins:maven-javadoc-plugin from 3.7.0 to 3.8.0

Bumps [org.apache.maven.plugins:maven-javadoc-plugin](https://github.com/apache/maven-javadoc-plugin) from 3.7.0 to 3.8.0.
- [Release notes](https://github.com/apache/maven-javadoc-plugin/releases)
- [Commits](apache/maven-javadoc-plugin@maven-javadoc-plugin-3.7.0...maven-javadoc-plugin-3.8.0)

---
updated-dependencies:
- dependency-name: org.apache.maven.plugins:maven-javadoc-plugin
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

pom.xml

@@ -24,7 +24,7 @@
         <slf4j.version>1.7.33</slf4j.version>
         <rxjava2.version>2.2.21</rxjava2.version>
 
-        <javadoc.version>3.7.0</javadoc.version>
+        <javadoc.version>3.8.0</javadoc.version>
         <checkstyle.version>3.4.0</checkstyle.version>
         <pmd.version>3.24.0</pmd.version>
         <project.info.version>3.6.2</project.info.version>