Log Message:
unicode-character-database: update to 12.1.0.

Upstream changes:

12.1.0:
 http://www.unicode.org/versions/Unicode12.1.0/

 Unicode 12.1 adds exactly one character, for a total of 137,929 characters.

 The new character added to Version 12.1 is:
  * U+32FF SQUARE ERA NAME REIWA

 Version 12.1 adds that single character to enable software to be
 rapidly updated to support the new Japanese era name in calendrical
 systems and date formatting. The new Japanese era name was officially
 announced on April 1, 2019, and is effective as of May 1, 2019.

12.0.0:
 http://www.unicode.org/versions/Unicode12.0.0/

 Unicode 12.0 adds 554 characters, for a total of 137,928 characters.
 These additions include 4 new scripts, for a total of 150 scripts,
 as well as 61 new emoji characters.