feat: Use license-expression as fallback for license (PEP-639)

[g3n35i5]

PEP-639 allows declaring the license in the License-Expression metadata field. Using this as fallback fixes resolving the licenses of some packages, e.g. termcolor==3.0.1, prettytable==3.16.0 and typing_extensions==4.13.1

Verifying the change

pip-licenses -p prettytable typing-extensions termcolor -a -s -u -d -f json

Before

[
  {
    "Author": "Luke Maurits <luke@maurits.id.au>",
    "Description": "A simple Python library for easily displaying tabular data in a visually appealing ASCII table format",
    "License": "UNKNOWN",
    "Name": "prettytable",
    "URL": "https://github.com/prettytable/prettytable",
    "Version": "3.16.0"
  },
  {
    "Author": "Konstantin Lepa <konstantin.lepa@gmail.com>",
    "Description": "ANSI color formatting for output in terminal",
    "License": "UNKNOWN",
    "Name": "termcolor",
    "URL": "https://github.com/termcolor/termcolor",
    "Version": "3.0.1"
  },
  {
    "Author": "\"Guido van Rossum, Jukka Lehtosalo, \u0141ukasz Langa, Michael Lee\" <levkivskyi@gmail.com>",
    "Description": "Backported and Experimental Type Hints for Python 3.8+",
    "License": "UNKNOWN",
    "Name": "typing_extensions",
    "URL": "https://github.com/python/typing_extensions",
    "Version": "4.13.1"
  }
]

After

[
  {
    "Author": "Luke Maurits <luke@maurits.id.au>",
    "Description": "A simple Python library for easily displaying tabular data in a visually appealing ASCII table format",
    "License": "BSD-3-Clause",
    "Name": "prettytable",
    "URL": "https://github.com/prettytable/prettytable",
    "Version": "3.16.0"
  },
  {
    "Author": "Konstantin Lepa <konstantin.lepa@gmail.com>",
    "Description": "ANSI color formatting for output in terminal",
    "License": "MIT",
    "Name": "termcolor",
    "URL": "https://github.com/termcolor/termcolor",
    "Version": "3.0.1"
  },
  {
    "Author": "\"Guido van Rossum, Jukka Lehtosalo, \u0141ukasz Langa, Michael Lee\" <levkivskyi@gmail.com>",
    "Description": "Backported and Experimental Type Hints for Python 3.8+",
    "License": "PSF-2.0",
    "Name": "typing_extensions",
    "URL": "https://github.com/python/typing_extensions",
    "Version": "4.13.1"
  }
]

This resolves #225
This relates to #89

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.13%. Comparing base (3fbf20f) to head (9505066).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #229   +/-   ##
=======================================
  Coverage   99.13%   99.13%           
=======================================
  Files           1        1           
  Lines         462      462           
=======================================
  Hits          458      458           
  Misses          4        4           

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[stefan6419846]

Duplicate of #213.

[g3n35i5]

Oops my bad