Improve development setup instructions, fix dependency list, and clarify documentation

[VHemanth45]

Metadata

• Reference Issue: Fixes Installation guide uses Python 3.8, which is incompatible with current OpenML requirements #1659
• New Tests Added: No
• Documentation Updated: Yes
• Change Log Entry: Fix documentation and dependency instructions in CONTRIBUTING.md and pyproject.toml

Details

• This PR updates the documentation and dependency instructions for the OpenML Python connector.
  The changes include:
• Fixing typos and formatting in CONTRIBUTING.md for clarity and consistency.
• Updating the recommended Python version for the development environment to 3.11 in the setup instructions.
• Correcting the uv pip install command to use quotes for extras (uv pip install -e ".[test]").
• Adding missing dependencies (openml, minio) to the [project.optional-dependencies] test section in pyproject.toml.
  Removing duplicate or unnecessary dependencies (such as openml-sklearn) from the test dependencies.
• Minor whitespace and formatting fixes for better readability.
  These changes are necessary to ensure contributors have up-to-date and accurate instructions for setting up their development environment and running tests, reducing confusion and setup errors.
  No new functionality or tests are added in this PR; it is focused on improving the developer experience and documentation accuracy.

[fkiraly]

Thanks for your contribution!

Removing the openml-sklearn and adding openml as a dep changes behaviour. Can you explain why you are doing this in a documentation PR?

[VHemanth45]

Thank you for your feedback!
I initially set out to improve the documentation, but while setting up the environment, I noticed some discrepancies and dependency issues. To ensure a smoother setup for future contributors, I fixed these issues in the same PR.
You can refer this #1659