Log Message:
py-fonttools: updated to 4.2.4

4.2.4:
- [unicodedata] Update RTL_SCRIPTS for Unicode 11 and 12.

4.2.3:
- [otTables] Fixed bug when splitting `MarkBasePos` subtables as offsets overflow.
  The mark class values in the split subtable were not being updated, leading to
  invalid mark-base attachments.
- [feaLib] Only log a warning instead of error when features contain duplicate
  substitutions.
- [glifLib] Strip XML comments when parsing with lxml