* Remove Windows 2016 environment, generate 64 bit installer
* Add note to changelog
* Use win_amd64 as installer suffix
* Bump PYTHON_BITNESS to 64
* Require 64 bit Windows for the installer_build job
* Update certbot install path
* update windows test name
* Base installer suffix on PYTHON_BITNESS again
* Update changelog to request users uninstall old version
It seems that all required pre-compiled wheels to install Certbot on Python 3.9 on Windows are present.
This PR upgrades Windows tests on Python 3.9 and repackages the installer on this version of Python.
In #8649 we added some code to trick pynsist and make it understand that `abi3` wheels for Windows are forward compatible, meaning that the cryptography wheel tagged `cp36-abi3` is in fact compatible with Python 3.6+, and not only Python 3.6.
Since pynsist 2.7 the tool now understand `abi3` wheels properly, and this trick is not needed anymore.
Please note that despite modifying the pynsist pinning in `dev_constraints.txt`, it will have no effect since pynsist currently escape the pinning system. This is handled in https://github.com/certbot/certbot/pull/8749.
* Pin pynsist
* Update dependencies
* Set windows installer a proper python project
* Optimize usage of the venvs
* Add windows-installer when venv is set up
* Fix call
* Remove env marker
