Invalid classifier string breaks delphi_utils PyPI upload

[melange396]

Between

• Release covidcast-indicators 0.3.56 #2052

and

• chore: sync prod->main #2053

...we got a failure in the GH action that publishes the delphi_utils package, saying: "'License :: MIT' is not a valid classifier."

The accepted version of this would be License :: OSI Approved :: MIT License according to https://pypi.org/classifiers/. The other classifier strings we use appear to be valid.

Fix it in

covidcast-indicators/_delphi_utils_python/pyproject.toml

Line 16 in 0da7b9a

"License :: MIT",

and

covidcast-indicators/_template_python/pyproject.toml

Line 16 in 0da7b9a

"License :: MIT",

[dshemetov]

For future reference, validate-pyproject could help catch issues like this in the future:

$ uv tool install 'validate-pyproject[all]'
Resolved 4 packages in 134ms
Prepared 3 packages in 49ms
Installed 4 packages in 5ms
 + fastjsonschema==2.20.0
 + packaging==24.1
 + trove-classifiers==2024.9.12
 + validate-pyproject==0.19
Installed 1 executable: validate-pyproject

# Running on _delphi_utils
$ uv tool run validate-pyproject pyproject.toml 
Invalid file: pyproject.toml
[ERROR] `project.classifiers[3]` must be trove-classifier

# After fix
$ uv tool run validate-pyproject pyproject.toml
Valid file: pyproject.toml