Continuing work towards #8988.
The first five commits were created using stubdefaulter on various Python versions; the following commits were all created manually by me to fix various problems. The main things this adds that weren't present in #9501 are:
- Defaults in Windows-only modules and Windows-only branches (because I'm running a Windows machine)
- Defaults in non-py311 branches
- Defaults for float parameters
- Defaults for overloads
* Split cgi.pyi into Py2 and 3 versions
* Restore correct Python 2 version of cgi.pyi
* Remove unnecessary version checks in cgi.pyi
* Use collections.abc
* Use List in Python 2 stub
A security fix added a "separator" argument to several URL parsing
functions and method in point releases:
* 3.6.13
* 3.7.10
* 3.8.8
* 3.9.2
Until all these versions are available on the GitHub Actions runners,
we need to whitelist the functions in the stubtests.
