Pytest-nunit

* Use lazy string formatting for logger by tonybaloney in https://github.com/pytest-dev/pytest-nunit/pull/77
* Support for Pytest 8 series by tonybaloney in https://github.com/pytest-dev/pytest-nunit/pull/78

* replace deprecated datetime.utcnow() functionality by dijkstrar in https://github.com/pytest-dev/pytest-nunit/pull/72
* Backward compatible version of the datetime.UTC attribute by tonybaloney in https://github.com/pytest-dev/pytest-nunit/pull/76

* Mute deprecation warning of getdefaultlocale until a better solution by tonybaloney in https://github.com/pytest-dev/pytest-nunit/pull/74

* Support for Python 3.12

* Fixes bug when used with xdist extension by tonybaloney in https://github.com/pytest-dev/pytest-nunit/pull/66

* Don't assert that call-report exists before checking value of attribute by tonybaloney in https://github.com/pytest-dev/pytest-nunit/pull/63
* Fix crash when ExceptionReprGroup is set for trace in test case by gh-ppolk in https://github.com/pytest-dev/pytest-nunit/pull/65
* [minor] Add xmlschema dev dependency by tonybaloney in https://github.com/pytest-dev/pytest-nunit/pull/62
* [minor] Add plugin coverage by tonybaloney in https://github.com/pytest-dev/pytest-nunit/pull/64