devel/py-wcwidth: Update to 0.2.6

Changes:

• Fix example for str.rjust(20, '_')
• Bugfix sphinx build on readthedocs.org
• Add CodeQL workflow for GitHub code scanning
• Switch to using importlib.metadata
• Use a new jinja2 templating process to update library to latest unicode

PR: 271769
Reported by: marcus@FreeBSD.org