bpo-33967: Remove use of deprecated assertRaisesRegexp() (GH-8261) (GH-8296)

It was added in test_functools at 445f1b3.
(cherry picked from commit 9e9b2c32a34594e901b5b9a03c561a2a2bf63ece)

Co-authored-by: Zackery Spytz <zspytz@gmail.com>
1 file changed