mail: convert SMTPException to bytes before passing to error.Abort()
Caught by pytype:
File "/mnt/c/Users/Matt/hg/mercurial/mail.py", line 168, in _smtp: Function Abort.__init__ was called with the wrong arguments [wrong-arg-types]
Expected: (self, message: Union[bytearray, bytes, memoryview], ...)
Actually passed: (self, message: smtplib.SMTPException)
Differential Revision: https://phab.mercurial-scm.org/D10168
edition = "2018"
max_width = 79
wrap_comments = true
error_on_line_overflow = true