Update docs with 3.10+ requirement

[aednichols]

I found this issue while investigating why a Python 3.9 CI environment lost the ability to run Poetry.

Pull Request Check List

Related-to: #10634
Related-to: DataBiosphere/calhoun#83

• Added tests for changed code.
• Updated documentation for changed code.

Summary by Sourcery

Documentation:

• Document Python 3.10+ as the minimum required version for Poetry instead of Python 3.9+.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Updates the documentation to state that Poetry now requires Python 3.10 or newer instead of 3.9+.

File-Level Changes

Change	Details	Files
Update documented minimum Python version requirement from 3.9+ to 3.10+.	Change the system requirements text to say Poetry requires Python 3.10+ instead of 3.9+ Ensure the minimum version statement in the main index docs matches current supported runtime versions	docs/_index.md

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[sourcery-ai]

Hey - I've reviewed your changes and they look great!

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