Update black to remove typed-ast dependency

Update black from 20.8b1 to >=22.0.0. The old version required typed-ast
which doesn't build on Python 3.8+. Newer black versions don't need it.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Author: semarj

requirements.txt

@@ -7,7 +7,7 @@ attrs==21.2.0; python_version >= "3.6" and python_full_version < "3.0.0" or pyth
 babel==2.9.1; python_version >= "3.5" and python_full_version < "3.0.0" or python_full_version >= "3.4.0" and python_version >= "3.5"
 backports.entry-points-selectable==1.1.0; python_version >= "2.7" and python_full_version < "3.0.0" or python_full_version >= "3.5.0" and python_version >= "2.7"
 base58==2.1.0; python_version >= "3.7" and python_version < "4.0"
-black==20.8b1; python_version >= "3.6"
+black>=22.0.0; python_version >= "3.6"
 certifi==2021.5.30; python_version >= "3.5" and python_full_version < "3.0.0" or python_full_version >= "3.6.0" and python_version >= "3.5"
 cfgv==3.3.0; python_full_version >= "3.6.1"
 chardet==4.0.0; python_version >= "3.6" and python_full_version < "3.0.0" or python_full_version >= "3.5.0" and python_version >= "3.6"