bump python-discovery minimum to 1.2.2

[rahuldevikar]

Following a fix for this: https://github.com/python-lz4/python-lz4/actions/runs/24358045293/job/71130129933?pr=337

virtualenv requires python-discovery>=1 which is too loose — it happily accepts 1.2.0. When cibuildwheel's constraints file pins an old version, pip sees no conflict with virtualenv's requirement and downgrades it.

If virtualenv bumped its minimum to python-discovery>=1.2.2, pip would reject the downgrade to 1.2.0 because it would violate virtualenv's dependency. The constraints file can't override a hard requirement from an installed package.

This would fix the issue at the root — virtualenv is the package that brings in python-discovery, so it should declare the minimum version it (and its ecosystem) actually needs.

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• ran the linter to address style issues (tox -e fix)
• wrote descriptive pull request text
• ensured there are test(s) validating the fix
• added news fragment in docs/changelog folder
• updated/extended the documentation