* fix: always reinstall pip
If the default pip version is also the latest one,
then the `pip` executable will be missing as the default pip
is installed only as `pip3`/`pip3.x`.
In order to always provide a `pip` executable, always reinstall pip.
* chore(ci): change default version to 3.12.3
Default to the latest stable version.
* fix: use `--upgrade` rather than `--ignore-installed` to upgrade pip
This removes left over files when upgrading pip.
* remove all installed python on macOS
* fix: error out on install failure in "Apply build artifact to the local machine" step
* fix: error out on pip installation / update failure
* fix: use environment variable for `PIP_ROOT_USER_ACTION`
This extends the fix from #259 since every platform for 3.8.10 / 3.9.13 has been rebuilt instead of just macOS arm64 being added.
The regression was introduced in #223
