Security update for python-pip

This update for python-pip fixes the following issues:

- CVE-2021-3572: Fixed incorrect handling of unicode separators in git references (bsc#1186819).

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

Fixed bugs
bnc#1186819
VUL-0: CVE-2021-3572: python27-pip,python-pip,python36-pip: pip incorrectly handled unicode separators in git references
Selected Binaries
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