Update packaging when trying to upload to pypi

[imciner2]

An error occurred while trying to upload the 0.1.9 release to pypi just now (https://github.com/osqp/qdldl-python/actions/runs/22152548280/job/64049297717):

Uploading distributions to https://upload.pypi.org/legacy/
ERROR    InvalidDistribution: Invalid distribution metadata: unrecognized or    
         malformed field 'license-file'                                         

Some digging shows this is related to versioning with twine and packaging, and according to pypa/twine#1216 (comment), we should ensure we update twine to 6.2+ and packaging to 25+. Twine was already being updated, so this adds an explicit update for packaging.

[vineetbansal]

Yes! I've had to make a similar change to some projects in the last couple of months as well.

[imciner2]

Great, thanks for looking at it. I've tagged a new release, so 🤞 it uploads to PyPi this time.