PYTHON-5647 remove redundant entry for *.mongodbgov.net

[kevinAlbs]

PYTHON-5647

Summary

Follow-up to a9c0344 to remove redundant entry for *.mongodbgov.net.

Changes in this PR

Remove redundant entry for *.mongodbgov.net in default ALLOWED_HOSTS.

Testing Plan

No observable behavior changes are expected.

Screenshots (optional)

N/A.

Checklist

Checklist for Author

• [ ] Did you update the changelog (if necessary)?
• [ ] Is the intention of the code captured in relevant tests?
• [ ] If there are new TODOs, has a related JIRA ticket been created?

Checklist for Reviewer {@primary_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?)
• Have you checked for spelling & grammar errors?
• Is all relevant documentation (README or docstring) updated?

Focus Areas for Reviewer (optional)

[blink1073]

Thank you!