PYTHON-6020 Move _have_dnspython into uri_parser_shared.py

[sleepyStick]

PYTHON-6020

Changes in this PR

the title says it all xD (not very exciting lol)

Test Plan

existing tests should pass :)

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]

🟢 Approval recommended

The change cleanly removes duplicated logic and updates all in-repo references without introducing new dependencies or breaking existing call sites.

Pull request overview

This PR centralizes the _have_dnspython() helper in pymongo/uri_parser_shared.py so URI parsing can check for dnspython without depending on either the synchronous or asynchronous SRV resolver modules, and updates SRV polling tests accordingly.

Changes:

• Added _have_dnspython() to pymongo/uri_parser_shared.py and removed the previous import from pymongo.asynchronous.srv_resolver.
• Removed duplicated _have_dnspython() definitions from both pymongo/asynchronous/srv_resolver.py and pymongo/synchronous/srv_resolver.py.
• Updated SRV polling tests (sync + async) to import _have_dnspython() from pymongo.uri_parser_shared.

File summaries

File	Description
test/test_srv_polling.py	Update SRV polling tests to import _have_dnspython from the shared URI parser module.
test/asynchronous/test_srv_polling.py	Same import update for the async SRV polling tests.
pymongo/uri_parser_shared.py	Defines _have_dnspython() locally to avoid depending on SRV resolver modules.
pymongo/synchronous/srv_resolver.py	Removes duplicated _have_dnspython() implementation.
pymongo/asynchronous/srv_resolver.py	Removes duplicated _have_dnspython() implementation.

Review details

• Files reviewed: 5/5 changed files
• Comments generated: 0
• Review effort level: Lite

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