fix: update uv.lock for old-python-constraint-project to match pyproject.toml

The uv.lock file had requires-python = ">=3.12" but the pyproject.toml
specified requires-python = ">=3.8,<=3.9". This mismatch caused the
test-no-python-version test to fail when uv tried to build the project
with Python 3.9, encountering a TypeError in the pathspec package due
to Python 3.9 compatibility issues.

The lock file has been regenerated to correctly reflect the Python
constraint in the pyproject.toml file.

Author: eifinger