Security update for python3

This update for python3 fixes the following issues:

Update to 3.6.12 (bsc#1179193), including:

- 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#1179193
Update python 3.6.10 -> 3.6.12
bnc#1176262
VUL-0: CVE-2019-20916: python3,python-pip: directory traversal in _download_http_url() function in src/pip/_internal/download.py
Selected Binaries
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