PYTHON-6138 followup -- Drop Python 3.9 and 3.10 Support

[sleepyStick]

PYTHON-XXXX

Changes in this PR

I think coverage version needed to be updated too (i believe that's all that needs to be changed)

really this PRs goal is to green the waterfall as a result of any changes relating to dropping python3.10

Test Plan

min deps failures fixed: https://spruce.corp.mongodb.com/version/6acea73c0defb10007703c5c/tasks?sorts=STATUS%3AASC%3BBASE_STATUS%3ADESC

Checklist

Checklist for Author

• Did you update the changelog (if necessary)?
• Is there test coverage?
• Is any followup work tracked in a JIRA ticket? If so, add link(s).

Checklist for Reviewer

• Does the title of the PR reference a JIRA Ticket?
• Do you fully understand the implementation? (Would you be comfortable explaining how this code works to someone else?)
• Is all relevant documentation (README or docstring) updated?

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

📢 Thoughts on this report? Let us know!

[Copilot]

🟢 Approval recommended

The dependency and Evergreen updates are consistent, narrowly scoped, and follow existing configuration patterns.

0 open findings

What changed in this PR

Updates minimum dependencies and Evergreen configuration following removal of Python 3.9/3.10 support.

Changes:

• Raises minimum Coverage.py version to 6.4.
• Restricts Ubuntu 22 Python 3.15t PyOpenSSL encryption tests to MongoDB 6.0+.
• Regenerates the Evergreen variant configuration.

File	Description
pyproject.toml	Updates the Coverage.py dependency floor.
uv.lock	Synchronizes the locked dependency metadata.
.evergreen/​scripts/​generate_config.py	Excludes unsupported MongoDB versions from the test variant.
.evergreen/​generated_configs/​variants.yml	Applies the generated Evergreen task selection.

🧠 Review effort: Balanced

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[blink1073]

LGTM