Build succeeded in Jenkins: Maven » Maven TLP » maven-surefire » jdk-16-17 #20

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See 
https://ci-builds.apache.org/job/Maven/job/maven-box/job/maven-surefire/job/jdk-16-17/20/

Changes:

* excluded java 16 in UmlautDirIT
* [travisci] openjdk15

All tests passed