cgi.parse_header() is deprecated in Python 3.11+

[cbrews]

We are using the cgi module to parse mime type in response.py. This is deprecated in Python 3.11 and will be removed in Python 3.13.

ignition/ignition/response.py

Line 194 in f800ffb

_, options = cgi.parse_header(meta)

Replace this usage with email module as defined in the specs:

from email.message import EmailMessage
msg = EmailMessage()
msg['content-type'] = 'application/json; charset="utf8"'
main, params = msg.get_content_type(), msg['content-type'].params

TODO: determine if this is backwards compatible to 3.7 or if we need conditional handling here.