Drop cgi module from test_multipart (#2424)

Drop cgi module from test_multipart (#2424)

* Use multipart instead of cgi for multipart tests

The cgi module has been deprecated as of python 3.11.

Signed-off-by: Vincent Fazio <vfazio@gmail.com>
* Update setup.cfg

All references to the cgi module have all been removed so there's no
longer a need to silence those deprecation warnings.

The deprecation warning for certifi is resolved as of version 2022.09.24.

Signed-off-by: Vincent Fazio <vfazio@gmail.com>
Signed-off-by: Vincent Fazio <vfazio@gmail.com>
Co-authored-by: Tom Christie <tom@tomchristie.com>