Update dependency org.xmlunit:xmlunit-legacy to v2.13.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
org.xmlunit:xmlunit-legacy (source)	2.12.0 → 2.13.0

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Release Notes

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

v2.13.0

• added explicit settings to the Validator classes that disable (external) DTD loading during validation. The default
  remains to allow loading of external content as this is often a requirement during validation.

  PRs #​331 and #​332 by
  @​jmestwa-coder

• added constructor overloads to JAXPXPathEngine to allow specifying the DocumentBuilderFactory used for the
  Source overloads of the selectNodes and evaluate methods.

  PRs #​333 by @​jmestwa-coder

• IsDateTimePlaceholderHandler now parses the explicit and ISO date formats using Locale.US rather than the JVM
  default locale so results no longer depend on the host locale. An optional second argument allows specifying a
  different locale as a BCP 47 language tag.

  PR #​335 by @​jmestwa-coder

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