python-packaging: bump to 26.0

python-packaging: bump to 26.0

Changes since 25.0:
- Added support for PEP 751 (pylock files) and PEP 794 (import
  name metadata); new metadata writing functionality
- Performance improvements: 3x speedup via regex caching, lazy
  Version key calculation, accelerated canonicalize_name
- Refined PEP 440 prerelease handling and SpecifierSet matching
- Improved Marker and Requirement subclassing support

Link: https://github.com/pypa/packaging/blob/main/CHANGELOG.rst
Signed-off-by: Alexandru Ardelean <redacted>