Use requests library to resolve SSL errors.

[robinjhuang]

Was getting some errors when installing custom nodes from registry on macOS:

  File "/Library/Frameworks/Python.framework/Versions/3.12/lib/python3.12/urllib/request.py", line 1347, in do_open
    raise URLError(err)
urllib.error.URLError: <urlopen error [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: unable to get local issuer certificate (_ssl.c:1000)>
^C

Currently, we use torchvision's util download function, which uses urllib3 to download files from a URL. However, that library only uses CPython's default bundled trusted certs which are not always complete. The requestslibrary uses certifi by default and I was able to resolve this issue by switching to it.

Ref: https://requests.readthedocs.io/en/latest/user/advanced/#ca-certificates

Requests uses certificates from the package [certifi](https://certifiio.readthedocs.io/).