PYTHON-5647 extend ALLOWED_HOSTS

[kevinAlbs]

PYTHON-5647

Summary

Extend OIDC ALLOWED_HOSTS with more Atlas host patterns.

Intended as a reference for the specification change.

Changes in this PR

Add the following patterns to ALLOWED_HOSTS:

• *.mongo.com
• *.mongodbgov.net

Testing Plan

A one-off test was performed with this script by modifying /etc/hosts to override DNS. This PR does not propose CI tests given the small scope of the change.

Checklist

Checklist for Author

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

Checklist for Reviewer @blink1073

• 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?

[blink1073]

LGTM, thank you!