v121.0 beta6 release

New to this release:

• Typeface.MakeEmpty()

Since m120:

• Typeface(),Typeface.MakeDefault(), Font() and Font(None, ...) ("default font/typeface") are deprecated upstream and usage now triggers warnings. Please migrate to explicit family/file/style choices.

What's Changed

• M121 public by @HinTak in #222
• Migrate to trusted publisher pypi workflow by @kyamagu in #228
• Add missing PyPI upload environment by @kyamagu in #229

See README.m121 for details.

Full Changelog: v120.0b5...v121.0b6