[issue46943] fix[imaplib]: call Exception with string instance

[Irit Katriel]

Irit Katriel <iritkatriel at gmail.com> added the comment:

The people subscribed to the closed pr will not receive an email about a new pr which is opened correctly. What makes you think they would?

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue46943>
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