On macOS hosts we are using external mirrors for installing with pyenv.
We should instead pull the necessary files from our local mirror.
Pick-to: 6.10 6.8
Change-Id: I6ba67dfd7cd37809164c7e2c4bcf89d07d45b1b2
Reviewed-by: Artem Dyomin <artem.dyomin@qt.io>
(cherry picked from commit bb77943c0f)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>