Bump xmlunit-matchers from 2.6.4 to 2.7.0 (#113)

Bumps [xmlunit-matchers](https://github.com/xmlunit/xmlunit) from 2.6.4 to 2.7.0.
- [Release notes](https://github.com/xmlunit/xmlunit/releases)
- [Changelog](https://github.com/xmlunit/xmlunit/blob/master/RELEASE_NOTES.md)
- [Commits](xmlunit/xmlunit@v2.6.4...v2.7.0)

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Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

pom.xml

@@ -73,7 +73,7 @@
         <slf4j.version>1.7.30</slf4j.version>
         <logback.version>1.2.3</logback.version>
         <jsonassert.version>1.5.0</jsonassert.version>
-        <xmlunit.version>2.6.4</xmlunit.version>
+        <xmlunit.version>2.7.0</xmlunit.version>
         <hibernate-validator.version>6.1.5.Final</hibernate-validator.version>
         <javax-el.version>2.2.6</javax-el.version>
         <jackson2.version>2.11.0</jackson2.version>