Update xmlUnit to v2.11.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
org.xmlunit:xmlunit-matchers (source)	2.10.3 -> 2.11.0
org.xmlunit:xmlunit-legacy (source)	2.10.3 -> 2.11.0

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Release Notes

xmlunit/xmlunit (org.xmlunit:xmlunit-matchers)

v2.11.0

• the xmlunit-jakarta-jaxb-impl no longer depends on org.glassfish.jaxb:jaxb-runtime directly.
  Issue #​313 PR #​314

  This is a breaking change and may force you to add an explicit dependency if you are using the module and rely on
  XMLUnit to provide the JAXB implementation.

v2.10.4

• attributes with null values could cause a NullPointerException.
  Issue #​307
  PR #​309

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