Remove Python 3.10 support

[eari100]

This commit removes Python 3.10 from the supported versions list in pyproject.toml.

Flax 0.12.0 and later versions officially support Python 3.11+.

Resolves #50

Please check issues for any pending model implementations. Consider opening issue if none exists.

Reference

Colab Notebook

Checklist

• I have read contribution guidelines.
• I have added all the necessary unit tests for my change. (run_model.py for usage, test_outputs.py and model_validation_colab.ipynb (if applicable) for quality).
• I have verified that my change does not break existing code and all unit tests pass.
• I have added all appropriate doc-strings/documentation.
• My PR is based on the latest changes of the main branch (if unsure, rebase the code).
• I have signed the Contributor License Agreement.

VAE(#46), efficientnet, qwen3(#49) was not tested.
And I couldn't test test_outputs.py (vgg, densenet), which depends on tensorflow, because it didn't work on my PC environment.

[jenriver]

Thanks for this change and adding the testing dependency!