FIX: Project classifier to be PyPI compatible

[SMoraisAnsys]

Seems like changes in #4784 introduced a typo in the package classifier which lead to release failure when uploading to PyPI.

Here is a fix following PyPI's classifiers.

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 82.70%. Comparing base (a170167) to head (8ff496e).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #4812 +/- ## ======================================= Coverage 82.70% 82.70% ======================================= Files 117 117 Lines 54151 54151 ======================================= + Hits 44784 44785 +1 + Misses 9367 9366 -1 ```