Fix import failure on matplotlib 3.11

[anevolbap]

Description

matplotlib 3.11 no longer auto-imports the matplotlib.style.core submodule, so the style.core.USER_LIBRARY_PATHS.append(...) call in preliz/__init__.py raises AttributeError at import time. This uses the top-level style.USER_LIBRARY_PATHS when it exists, falls back to style.core for older matplotlib, and calls style.reload_library() (present on all supported versions).

Checked across matplotlib 3.9, 3.10, and 3.11: style.USER_LIBRARY_PATHS exists only on 3.11, style.core exists on 3.9 and 3.10, and style.reload_library exists on all three, so the guard covers the full matplotlib>=3.9 range.

Closes #726.

Checklist

• Code style is correct (follows ruff guidelines)

[codecov-commenter]

Codecov Report

❌ Patch coverage is 75.00000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 82.15%. Comparing base (2e0d391) to head (5b032d9).

Files with missing lines	Patch %	Lines
preliz/__init__.py	75.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #727      +/-   ##
==========================================
- Coverage   82.16%   82.15%   -0.01%     
==========================================
  Files         112      112              
  Lines       10641    10643       +2     
==========================================
+ Hits         8743     8744       +1     
- Misses       1898     1899       +1     

☔ View full report in Codecov by Harness.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[aloctavodia]

thanks @anevolbap