bug#63205: quodlibet fails to build after python 3.10 update

[Zack Weinberg]

After the core-updates merge (specifically after the bump to python 3.10, I 
would guess) quodlibet's testsuite has one failing test and therefore the 
package fails to build:

=================================== FAILURES ===================================
_______________________ TCoverManager.test_invalid_glob ________________________
tests/test_util_cover.py:111: in test_invalid_glob
    os.path.abspath(self._find_cover(self.song).name), f)
E   AttributeError: 'NoneType' object has no attribute 'name'
=========================== short test summary info ============================
FAILED tests/test_util_cover.py::TCoverManager::test_invalid_glob - Attribute...
===== 1 failed, 3257 passed, 53 skipped, 139 warnings in 90.85s (0:01:30) ======

Full build log is attached.

$ guix describe
Generation 19   May 01 2023 08:59:02    (current)
  guix 0c6a7e1
    repository URL: https://git.savannah.gnu.org/git/guix.git
    branch: master
    commit: 0c6a7e1045cbd06336ef3699734a803a2e4038e5

gj1mb1y5bchcq9pm4rsh7x8pyq0fs3-quodlibet-4.5.0.drv.gz
Description: application/gzip