deps: bump org.apache.maven.plugins:maven-javadoc-plugin

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] <support@github.com>

pom.xml

@@ -53,7 +53,7 @@
 		<maven-flatten-plugin.version>1.6.0</maven-flatten-plugin.version>
 		<maven-gpg-plugin.version>3.2.4</maven-gpg-plugin.version>
 		<maven-jar-plugin.version>3.4.2</maven-jar-plugin.version>
-		<maven-javadoc-plugin.version>3.7.0</maven-javadoc-plugin.version>
+		<maven-javadoc-plugin.version>3.8.0</maven-javadoc-plugin.version>
 		<maven-source-plugin.version>3.3.1</maven-source-plugin.version>
 		<maven-surefire-plugin.version>2.22.2</maven-surefire-plugin.version>
 		<maven.compiler.source>1.8</maven.compiler.source>