Running sigridci.py on Windows

[sten-rosendahl]

We encountered a similar problem when running sigridci.py on a Windows machine, it didn't found valid certificates in python 3.9. One solution that works without manually adding a pem file (which was suggested in issue #72) is to use certifi and ssl and replace the standard call:
urllib.request.urlopen(uploadRequest)
with:
urllib.request.urlopen(uploadRequest, context=ssl.create_default_context(cafile=certifi.where()))

Originally posted by @sten-rosendahl in #72 (comment)

[gsmeets]

I ran into the same issue. I was able to fix it by rerunning the Python install, and adding tcl/tk and IDLE and Python test suite to the install. Not sure why that fixed it, I guess it installs something that is used by the SSL subsystem.