imaplib's CommandResults has unnecessary Any

[dkg]

In imaplib, CommandResults is too generic.

imaplib's documentation says:

Each command returns a tuple: (type, [data, ...]) where type is usually 'OK' or 'NO' , and data is either the text from the command response, or mandated results from the command. Each data is either a string, or a tuple. If a tuple, then the first part is the header of the response, and the second part contains the data (ie: ‘literal’ value).

However, use of imaplib in python3 reveals this documentation to date from py2's confusion between bytes and strings, because the "strings" are actually bytes.

[hauntsaninja]

Closing based on discussion in #3655