Log Message:
Update msmtp to 1.4.27.
contains fixes for PR#45785.

Version 1.4.27:
- Always use the internal MD5 functions for the built-in CRAM-MD5
  implementation; never use the ones from OpenSSL. This fixes problems with
  configurations that use OpenSSL and do not use GNU SASL. Thanks to Gleydson
  Soares and Moritz Wilhelmy for providing information and for testing the fix.
- Fix a compiler warning with current OpenSSL versions.