Fix bug in unittest-xml-reporting on Python 3.11+

[Flamefire]

(created using eb --new-pr)

During a test on foss/2024a I've seen

File "/lib/python3.12/unittest/runner.py", line 152, in printErrors
self.stream.writeln(f"UNEXPECTED SUCCESS: {self.getDescription(test)}")
^^^^^^^^^^^^^^^^^^^^^^^^^
File "/lib/python3.12/unittest/runner.py", line 50, in getDescription
doc_first_line = test.shortDescription()
^^^^^^^^^^^^^^^^^^^^^
AttributeError: 'tuple' object has no attribute 'shortDescription'

This will be fixed by xmlrunner/unittest-xml-reporting#274 which is not yet merged but looks correct. So I just picked that commit to avoid this in our Python 3.11/3.12 EasyConfigs

[Flamefire]

Test report by @Flamefire
SUCCESS
Build succeeded for 4 out of 4 (4 easyconfigs in total)
login3.barnard.hpc.tu-dresden.de - Linux RHEL 8.9 (Ootpa), x86_64, Intel(R) Xeon(R) Platinum 8470 (icelake), Python 3.8.17
See https://gist.github.com/Flamefire/3113368a57e62c741effe3073c81ae45 for a full test report.

[Flamefire]

Test report by @Flamefire
SUCCESS
Build succeeded for 4 out of 4 (4 easyconfigs in total)
login1.romeo.hpc.tu-dresden.de - Linux Rocky Linux 8.9 (Green Obsidian), x86_64, AMD EPYC 7702 64-Core Processor (zen2), Python 3.8.17
See https://gist.github.com/Flamefire/8764b50efbf3cc0cd303f50536431856 for a full test report.