Log Message:
liberation-ttf: update to 2.1.5.

ChangeLog:

* Thu Sep 30 2021 Vishal Vijayraghavan <vishalvijayraghavan@gmail.com>
- Releasing liberation-fonts 2.1.5 version
- Resolves #40: More fixes to Superscript and subscript Numbers missing issues
-- fixed inconsistent weight, missing glyphs and GSUB issues

* Tue May 04 2021 Vishal Vijayraghavan <vishalvijayraghavan@gmail.com>
- Releasing liberation-fonts 2.1.4 version
- Resolves #40: Superscript and subscript Numbers missing
- Resolves #24: Gender symbol are inconsistent in Sans