`!pep` incorrectly returns status of PEP

[PythonTryHard]

Relevant discussion: https://discord.com/channels/267624335836053506/267624335836053506/1293835843454242816

Summary of discussion: PEP 760 has been withdrawn, but at the time of discussion, !pep 760 still returns "Draft" for status.

Possible causes suggested:

• Caching is faulty (by @eivl, @thurisatic)