Bug: remove the PyCon US 2026 banner

[gpshead]

Describe the bug

https://www.python.org/downloads/ still has a "Join us at PyCon US 2026 in Long Beach, CA starting May 13! Grab your ticket today before they're gone." and registration button on it.

To Reproduce

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Expected behavior

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URL to the issue

https://www.python.org/downloads/

Screenshots

Browsers

Chrome

Operating System

Other

Browser Version

No response

Relevant log output

Additional context

No response

[linear-code]

PYORG-2982

[gpshead]

(it looks like this is just a thing in the database that needs to be removed)