Reproduction repo for a pip-tools bug

Issue: jazzband/pip-tools#1589

Companion repositories:

• https://github.com/RedRoserade/pip-tools-repro-repo-b
• https://github.com/RedRoserade/pip-tools-repro-repo-c

Testing this

1. Create a Virtual Environment (this has been tested on Python 3.10, but 3.8 shows the same issue)
2. Use the scripts compile-XYZ.sh to compile the associated requirements-XYZ.txt files
3. Investigate the output

Notes

Repository B has two relevant branches that serve as variants:

• test/pep-440-url: https://github.com/RedRoserade/pip-tools-repro-repo-b/tree/test/pep-440-url
• test/remove-c-dep: https://github.com/RedRoserade/pip-tools-repro-repo-b/tree/test/remove-c-dep

They are referenced (commented out) in requirements.in.

Also, for pip-tools<6.5, pip<22 is installed to prevent incompatibilities.