[MAINTENANCE] Use Trusted Publishers credentials instead of User/Password for uploading releases to PyPi

[alexsherstinsky]

Scope

PyPi finally discontinued the use of user/password credentials for publishing releases; the sanctioned approach is called "Trusted Publishers" ("https://docs.pypi.org/trusted-publishers/"). Hence, this change updates the corresponding GitHub actions pipeline.

Code Pull Requests

Please provide the following:

• a clear explanation of what your code does
• if applicable, a reference to an issue
• a reproducible test for your PR (code, config and data sample)

Documentation Pull Requests

Note that the documentation HTML files are in docs/ while the Markdown sources are in mkdocs/docs.

If you are proposing a modification to the documentation you should change only the Markdown files.

api.md is automatically generated from the docstrings in the code, so if you want to change something in that file, first modify ludwig/api.py docstring, then run mkdocs/code_docs_autogen.py, which will create mkdocs/docs/api.md .

[github-actions[bot]]

Unit Test Results

  6 files  ±0    6 suites  ±0   14m 15s :stopwatch: -9s 12 tests ±0    9 :heavy_check_mark: ±0    3 :zzz: ±0  0 :x: ±0  60 runs  ±0  42 :heavy_check_mark: ±0  18 :zzz: ±0  0 :x: ±0 

Results for commit d30b0654. ± Comparison against base commit 31a39578.