[3.14] gh-84424: Use numeric_changed for UCD.numeric (GH-19457) (GH-144731)

This was causing ucd_3_2_0.numeric() to pick up only decimal
changes between Unicode 3.2.0 and the current version.
(cherry picked from commit 3e0322ff16f47caa3e273d453f007d3918b8ac80)

Co-authored-by: William Meehan <wmeehan@fb.com>