PYTHON-5858 - Upgrade ruff from v0.1.3 to v0.15.15

[NoahStapp]

PYTHON-5858

Changes in this PR

Update ruff to v0.15.15 and change linting accordingly. This included bumping our target version for linting from Python 3.7 to 3.9.

Test Plan

Existing test suite.

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). PYTHON-5881

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?

[Copilot]

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[codecov-commenter]

Codecov Report

❌ Patch coverage is 90.78591% with 34 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
bson/__init__.py	70.00%	4 Missing and 5 partials ⚠️
pymongo/asynchronous/cursor.py	50.00%	1 Missing and 2 partials ⚠️
pymongo/asynchronous/topology.py	57.14%	3 Missing ⚠️
pymongo/common.py	50.00%	1 Missing and 2 partials ⚠️
pymongo/operations.py	76.92%	3 Missing ⚠️
bson/regex.py	71.42%	2 Missing ⚠️
pymongo/synchronous/cursor.py	66.66%	0 Missing and 2 partials ⚠️
bson/binary.py	80.00%	0 Missing and 1 partial ⚠️
bson/json_util.py	93.33%	0 Missing and 1 partial ⚠️
pymongo/asynchronous/auth_aws.py	66.66%	1 Missing ⚠️
... and 6 more

📢 Thoughts on this report? Let us know!

[blink1073]

1. There are some merge conflicts
2. Did ruff make all of the changes, or were any by hand?

[NoahStapp]

1. There are some merge conflicts
2. Did ruff make all of the changes, or were any by hand?

1. Resolved, sorry about that.
2. I had to make a lot of manual changes (LLM-assisted).

[blink1073]

Okay, the remaining failures look like PYTHON-5882. I'll review in batches. 😅

[blink1073]

LGTM