Security update for libass

This update for libass fixes the following issues:

- CVE-2020-24994: Fixed a stack overflow in the parse_tag (bsc#1184153).

This update was imported from the SUSE:SLE-15:Update update project.

Fixed bugs
bnc#1184153
VUL-0: CVE-2020-24994: libass: Stack overflow in the parse_tag function in libass/ass_parse.c
Selected Binaries
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