Add missing `pyproject_hooks` to DEBUNDLED preload list

[mgorny]

Otherwise, tests fail to load:

ImportError while loading conftest '/tmp/portage/dev-python/pip-24.1-r1/work/pip-24.1/tests/conftest.py'.
tests/conftest.py:49: in <module>
    from pip._internal.utils.temp_dir import global_tempdir_manager
../pip-24.1-python3_13/install/usr/lib/python3.13/site-packages/pip/_internal/utils/temp_dir.py:20: in <module>
    from pip._internal.utils.misc import enum, rmtree
../pip-24.1-python3_13/install/usr/lib/python3.13/site-packages/pip/_internal/utils/misc.py:38: in <module>
    from pip._vendor.pyproject_hooks import BuildBackendHookCaller
E   ModuleNotFoundError: No module named 'pip._vendor.pyproject_hooks'

[pradyunsg]

https://pypi.org/project/pyproject-api/ is not the same as https://pypi.org/project/pyproject-hooks/ :)

[mgorny]

Ah, sorry, brainfart.

[sbidoul]

Thanks. Let's remove pep517 from that list at the same time.

[mgorny]

Thnaks. Let's remove pep517 from that list at the same time.

Added.

[ichard26]

Ah, this still needs a NEWS entry. This can probably go under the vendor category.

[mgorny]

Ah, this still needs a NEWS entry. This can probably go under the vendor category.

Very well. I thought it's not worth including since FWIU this isn't really a "supported" territory but I'll add one.

[ichard26]

My line of reasoning is that the vendor category is already obtuse to regular users, so it's likely primarily the downstream redistributors that read the vendor changelog entries. They may want to know about this change, hence my ask for an entry.

[sbidoul]

Pre-commit is complaining, though.

[mgorny]

That's what I get for merging suggestions :-). Lemme fix that quickly.

[mgorny]

Thanks!