Relies on the pipes module, removed from the standard library in Python 3.13

[musicinmybrain]

$ gh repo clone xolox/python-coloredlogs
$ cd python-coloredlogs
$ tox -e py312

(all tests pass)

$ tox -e py313

==================================================================================================== ERRORS ====================================================================================================
____________________________________________________________________________________ ERROR collecting coloredlogs/tests.py _____________________________________________________________________________________
ImportError while importing test module '/home/ben/src/forks/python-coloredlogs/coloredlogs/tests.py'.
Hint: make sure your test modules/packages have valid Python names.
Traceback:
/usr/lib64/python3.13/importlib/__init__.py:88: in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
coloredlogs/tests.py:22: in <module>
    from humanfriendly.testing import PatchedAttribute, PatchedItem, TestCase, retry
.tox/py313/lib/python3.13/site-packages/humanfriendly/testing.py:28: in <module>
    import pipes
E   ModuleNotFoundError: No module named 'pipes'
=========================================================================================== short test summary info ============================================================================================
ERROR coloredlogs/tests.py
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! Interrupted: 1 error during collection !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
=============================================================================================== 1 error in 0.09s ===============================================================================================

I will follow up with a PR to replace pipes.quote with shlex.quote, as in xolox/python-humanfriendly#75. The shlex.quote() API is available from Python 3.3 on; pipes.quote() was never documented.