[:bug:] Issue on Twine Upload

[uncatchable-de]

Describe the bug
If uploading the published whl files on an internal repository with Twine 6.1.0, an error is thrown:
ERROR InvalidDistribution: Invalid distribution metadata: license-expression introduced in metadata version 2.4, not 2.1

The license-expression is used here: https://github.com/jawah/kiss-headers/blob/master/pyproject.toml#L9

To Reproduce
Steps to reproduce the behavior:

• Download whl with pip download kiss-headers --no-deps -d <directory>
• Upload whl with: twine upload --repository-url https://artifactory.com/artifactory/api/pypi/pypi-local <directory>

Expected behavior
The package should be compatible with Twine. Please update the metadata version or remove the expression from pyproject.toml.

Additional context
This is necessary in business environments, where only internal Repositories are allowed.

[uncatchable-de]

Please note that for testing the repository URL must not be reachable.

[uncatchable-de]

Closing this issue. It seems to be a TWINE issue: pypa/twine#1216