{Packaging} Upgrade virtualenv to 16.7.11 to fix install on python 3.10

[pallxk]

pypa/virtualenv#2109
https://virtualenv.pypa.io/en/legacy/changes.html#v16-7-11-2021-07-20

Description

Linux install script is not working with Python 3.10 (#20713) due to the fact the version of virutalenv is pinned to 16.7.7, which is not compatible with python 3.10. This PR upgrades virtualenv to 16.7.11.

Testing Guide

docker run --rm -it python:3.10 bash

# errored out
curl -o install_old.py https://raw.githubusercontent.com/Azure/azure-cli/azure-cli-2.31.0/scripts/curl_install_pypi/install.py
python install_old.py

# works
curl -o install_new.py https://raw.githubusercontent.com/pallxk/azure-cli/fix-install-script-py-3.10/scripts/curl_install_pypi/install.py
python install_new.py

History Notes

[Packaging] Fix install script on Python 3.10

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[ghost]

Thank you for your contribution pallxk! We will review the pull request and get back to you soon.

[jiasli]

Thanks a lot for the contribution. BTW, this is another evidence showing perhaps we should drop these files (#20476).