Update of XMLUnit

[Mechtilde Stehmann]

Hello,

I want to package libmustang-cli-java (Bug#1094988)
Therefore I need xmlunit-core and xmlunit-assertj.

I find the sources under https://github.com/xmlunit/xmlunit/tree/main

Should I update https://salsa.debian.org/java-team/xmlunit to version 
2.10 or ...

Should I better create a new package libxmlunit2-java

Kind regards

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Mechtilde Stehmann
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