Security update for python-pip

This update for python-pip fixes the following issues:

- Fixed a directory traversal in _download_http_url() (bsc#1176262 CVE-2019-20916)

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

Fixed bugs
bnc#1176262
VUL-0: CVE-2019-20916: python3,python-pip: directory traversal in _download_http_url() function in src/pip/_internal/download.py
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