chore(deps-dev): update xmldiff requirement from 2.6.3 to 2.7.0 (#104)

Updates the requirements on [xmldiff](https://github.com/Shoobx/xmldiff) to permit the latest version.
- [Release notes](https://github.com/Shoobx/xmldiff/releases)
- [Changelog](https://github.com/Shoobx/xmldiff/blob/master/CHANGES.rst)
- [Commits](https://github.com/Shoobx/xmldiff/commits)

---
updated-dependencies:
- dependency-name: xmldiff
  dependency-type: direct:development
...

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pyproject.toml

@@ -60,7 +60,7 @@ defusedxml = "^0.7.1"
 [tool.poetry.dev-dependencies]
 tox = "4.11.4"
 coverage = "7.5.1"
-xmldiff = "2.6.3"
+xmldiff = "2.7.0"
 mypy =  "1.10.0"
 autopep8 = "2.1.0"
 isort = "5.13.2"