dependency: bump org.apache.maven.plugins:maven-javadoc-plugin from 3.5.0 to 3.6.2 in /sevntu-checkstyle-idea-extension #310

Job	Run time
no-exception (checkstyle)	2m 4s
no-exception (struts)	1m 48s
no-exception (guava)	5m 28s
no-exception (hibernate-orm)	3m 5s
no-exception (spotbugs)	2m 8s
no-exception (spring-framework)	2m 53s
no-exception (hbase)	3m 2s
no-exception (pmd-elasticsearch-lombok-ast)	4m 30s
no-exception (alot-of-projects)	3m 7s
	28m 5s

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