Bump Maven dependencies and plugins

5 jobs for 2.x in 1 minute and 13 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  Build
failed checkstyle #179100
maven allowed to fail

00:00:24

passed compile #179101
maven

00:00:35

 
  Post Build
passed package #179103
maven

00:00:31

passed unit_test #179102
maven

00:00:38

 
  Deploy
manual tomcat_development #179104
python allowed to fail manual
 
Name Stage Failure
failed
checkstyle Build
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-checkstyle-plugin:3.1.0:check (default-cli) on project arsnova-backend: You have 458 Checkstyle violations. -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoFailureException
ERROR: Job failed: exit code 1