Check new version from pypi instead of our api: fix pysimai version check

[awoimbee]

🎫 https://app.shortcut.com/simai/story/26689/pysimai-fetch-latest-release-from-pypi

Our API stopped containing the latest pysimai version when it moved to this repo.
Since it's now on pypi we can just query there instead of querying our API.

I kept warn_package_outdated quite generic so internal packages can use it too (just like they did with _check_for_new_version before).

[codecov]

Codecov Report

Attention: Patch coverage is 76.19048% with 5 lines in your changes missing coverage. Please review.

Project coverage is 85.48%. Comparing base (9612243) to head (128463c).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/ansys/simai/core/client.py	57.14%	3 Missing ⚠️
src/ansys/simai/core/utils/misc.py	85.71%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #110      +/-   ##
==========================================
- Coverage   85.55%   85.48%   -0.07%     
==========================================
  Files          44       44              
  Lines        2630     2639       +9     
==========================================
+ Hits         2250     2256       +6     
- Misses        380      383       +3     

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