Security update for libxml2

This update for libxml2 fixes the following issues:

- CVE-2021-3541: Fixed exponential entity expansion attack bypasses all existing protection mechanisms. (bsc#1186015)

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

Fixed bugs
bnc#1186015
VUL-0: CVE-2021-3541: python-libxml2,libxml2-python,libxml2,python-libxml2-python: libxml2: Exponential entity expansion attack bypasses all existing protection mechanisms
Selected Binaries
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