Security update for expat

This update for expat fixes the following issues:

Security issues fixed:

- CVE-2019-15903: Fixed heap-based buffer over-read caused by crafted XML input. (bsc#1149429)

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

Fixed bugs
bnc#1149429
VUL-0: CVE-2019-15903: expat: crafted XML input results in heap-based buffer over-read by fooling the parser into changing from DTD parsing to document parsing
Selected Binaries
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