Update Unicode version in unicode_data.py to 13.0
Update Unicode version in unicode_data.py to 13.0

Update Unicode version in unicode_data.py to 13.0. The data files in third_party/ucd already use Unicode 13

googlefonts/nototools,googlefonts/nototools,googlefonts/nototools,googlefonts/nototools,googlefonts/nototools