CaseInsensitiveOrderedMultiDict breaks url.X.insteadOf config when using access token in URL

[sjawhar]

Since ConfigDict uses a CaseInsensitiveOrderedMultiDict to store its values, and since access tokens are not case-inensitive, using url.insteadOf to insert credentials into the clone URL does not work (unless your access token happens to be all lower case)

dulwich/dulwich/config.py

Lines 254 to 268 in 264c5b6

	class ConfigDict(Config, MutableMapping[Section, MutableMapping[Name, Value]]):
	"""Git configuration stored in a dictionary."""
	def __init__(
	self,
	values: Union[
	MutableMapping[Section, MutableMapping[Name, Value]], None
	] = None,
	encoding: Union[str, None] = None
	) -> None:
	"""Create a new ConfigDict."""
	if encoding is None:
	encoding = sys.getdefaultencoding()
	self.encoding = encoding
	self._values = CaseInsensitiveOrderedMultiDict.make(values)