PYTHON-6006 Add MongoDB 9.0 to the Evergreen test matrix

[blink1073]

PYTHON-6006

Changes in this PR

Added MongoDB 9.0 to the set of server versions tested in the Evergreen test matrix (ALL_VERSIONS in .evergreen/scripts/generate_config_utils.py), following the same pattern used for the 8.0 release. Regenerated the Evergreen config files (tasks.yml, variants.yml) to include the new mongodb-v9.0 variant and corresponding matrix tasks.

Test Plan

• Ran just lint and just typing, both pass.
• I dispatched all of the 9.0 tasks on this patch (all green)

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.

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[Copilot]

Pull request overview

Adds MongoDB 9.0 to PyMongo’s Evergreen CI matrix by extending the version list used by the config generator and regenerating the derived tasks.yml/variants.yml so a mongodb-v9.0 buildvariant and corresponding matrix tasks are available.

Changes:

• Added "9.0" to ALL_VERSIONS used by Evergreen config generation.
• Regenerated Evergreen build variants and task definitions to include MongoDB 9.0 coverage.
• Updated the changelog with a MongoDB 9.0-related bullet (needs wording adjustment per review comment).

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
doc/changelog.rst	Adds a MongoDB 9.0 bullet in the release notes (currently reads like a user-facing feature).
.evergreen/scripts/generate_config_utils.py	Extends the version list to include MongoDB 9.0 for config generation.
.evergreen/generated_configs/variants.yml	Adds the mongodb-v9.0 buildvariant and includes .server-9.0 selectors in relevant variants.
.evergreen/generated_configs/tasks.yml	Regenerated task matrix to include MongoDB 9.0 tasks (and associated rotations).

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