pip-tools v7.5.2 is incompatible with pip>=26

[bjester]

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Observed behavior

I've been using uv venv --seed to create virtualenvs. The --seed parameter adds in pip and setuptools, but usually the most recent versions. This uncovered that the latest version of pip has an issue with pip-tools, so running pip-compile requirements.in will fail.

Additionally, pip and pip-tools have been having recurring conflicts which cause friction. We might consider wholly adopting the uv approach, and drop pip-tools

Errors and logs

AttributeError: 'InstallRequirement' object has no attribute 'use_pep517'
# or
AttributeError: 'PackageFinder' object has no attribute 'allow_all_prereleases'

Expected behavior

We're able to compile our dependency files-- pip and pip-tools are compatible.

User-facing consequences

Developers may encounter this and not understand what's wrong. The recurring issues with these packages cause us headaches.

Steps to reproduce

1. Run uv venv --seed to create virtualenv
2. Install all packages
3. Attempt to run pip-compile requirements.in