Merge pull request #20 from opentripplanner/renovate/maven-javadoc-plugin.version

Update dependency org.apache.maven.plugins:maven-javadoc-plugin to v3.12.0

Author: leonardehrenfried

pom.xml

@@ -75,7 +75,7 @@
     <maven-exec-plugin.version>1.6.0</maven-exec-plugin.version>
     <maven-surefire-plugin.version>2.22.2</maven-surefire-plugin.version>
     <maven-source-plugin.version>3.2.1</maven-source-plugin.version>
-    <maven-javadoc-plugin.version>3.3.1</maven-javadoc-plugin.version>
+    <maven-javadoc-plugin.version>3.12.0</maven-javadoc-plugin.version>
     <maven-release-plugin.version>3.3.1</maven-release-plugin.version>
     <maven-gpg-plugin.version>1.6</maven-gpg-plugin.version>
     <maven-dependency-plugin.version>3.1.2</maven-dependency-plugin.version>