Bump xmlunit-matchers from 2.6.3 to 2.7.0 (#31)

Bumps [xmlunit-matchers](https://github.com/xmlunit/xmlunit) from 2.6.3 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@v2.6.3...v2.7.0)

Signed-off-by: dependabot[bot] <support@github.com>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

pom.xml

@@ -187,7 +187,7 @@ under the License.
  <dependency>
  <groupId>org.xmlunit</groupId>
  <artifactId>xmlunit-matchers</artifactId>
- <version>2.6.3</version>
+ <version>2.7.0</version>
  <scope>test</scope>
  </dependency>