fix: read exact versions from Python lockfiles for OSV

[Root-Aamir]

Fixes #233.
This adds support for reading exact package versions from Python TOML lockfiles such as uv.lock and poetry.lock, so OSV queries use the installed package version instead of falling back to package-name-only lookups.
Changes:

• Detect uv.lock and poetry.lock as Python dependency files.
• Parse [[package]] entries and their exact versions.
• Pass extracted versions through the existing OSV query flow.
• Add regression tests for uv.lock and poetry.lock version handling.
  Test:
• ..venv\Scripts\python.exe -m pytest tests\nodes\analyzers\test_static_patterns_supply_chain_lockfiles.py -q