Update requirements.txt for CatCmaSampler

[c-bata]

Contributor Agreements

Please read the contributor agreements and if you agree, please click the checkbox below.

• I agree to the contributor agreements.

Tip

Please follow the Quick TODO list to smoothly merge your PR.

Motivation

To avoid installing cmaes from GitHub.

Description of the changes

I've just released cmaes v0.11.0 with CatCMA support, thus we can install cmaes via PyPI.

TODO List towards PR Merge

• Copy ./template/ to create your package
• Replace <COPYRIGHT HOLDER> in LICENSE of your package with your name
• Fill out README.md in your package
• Add import statements of your function or class names to be used in __init__.py
• Apply the formatter based on the tips in README.md
• Check whether your module works as intended based on the tips in README.md

[c-bata]

Please let me know if I need to check the todo list 🙏 This PR simply updates requirements.txt though.

[y0z]

LGTM