gh-92886: Fix test that fails when running with `-O` in `test_imaplib.py` (GH-93237)

(cherry picked from commit 8150b8cf7fe09d601246f5bdc6456a0e31f31bca)

Co-authored-by: jackh-ncl <1750152+jackh-ncl@users.noreply.github.com>
2 files changed