Log Message:
py-soupsieve: update to 2.6.

NEW: Add official support for Python 3.13.
NEW: Add support for & as scoping root per the CSS Nesting Module, Level 1. \ 
When & is used outside the
context of nesting, it is treated as the scoping root (equivalent to :scope).
FIX: Improve error message when an unrecognized pseudo-class is used.