Prepare release 8.0.27

Author: nmariz

CHANGES.txt

@@ -8,6 +8,12 @@ Copyright (c) 2009, 2021, Oracle and/or its affiliates.
 Full release notes:
  http://dev.mysql.com/doc/relnotes/connector-python/en/
 
+v8.0.27
+=======
+
+- WL#14689: Fallback conversion to str for types incompatible with MySQL
+- WL#14667: Support for Multi Factor authentication (c-ext)
+
 v8.0.26
 =======