Add python3.6 pip support

Since pip v22, python3.6 is not supported (the minimum version is
python3.7). This patch adds the reference for the pip3.6 URL to be
used instead of the default one.

Closes-Bug: #1959600
Change-Id: Iab2c391d5388461fe9e9037cee81884ce8032e72
1 file changed