c85fce39b broke importing standard library modules that are "masked"

[s-t-e-v-e-n-k]

• a detailed description of the bug or problem you are having
• output of pip list from the virtual environment you are using
• pytest and operating system versions
• minimal example if possible

As reported in this jaraco.test issue comment, this commit broke the ability to import test.support, which is in the standard library, while testing jaraco.test.

pip list:

abuild@conjecture:/home/abuild> pip list
Package            Version
------------------ -----------------------
annotated-types    0.6.0
attrs              23.2.0
autocommand        2.2.2
backports.tarfile  1.0.0
inflect            7.0.0
iniconfig          2.0.0
jaraco.classes     3.4.0
jaraco.collections 5.0.1
jaraco.context     5.3.0
jaraco.functools   4.0.0
jaraco.text        3.12.0
more-itertools     10.2.0
packaging          24.0
pip                24.0
pluggy             1.5.0
pydantic           2.7.1
pydantic_core      2.18.2
pytest             8.1.0.dev253+gc85fce39b
setuptools         69.0.3
setuptools-scm     8.0.4
toml               0.10.2
typing_extensions  4.11.0
wheel              0.43.0

Operating system: openSUSE Tumbleweed

The minimal example would be running jaraco.test's testsuite under pytest, I guess.