Consider removing deprecated config api

[ferrine]

THe deprecation was introduced by @michaelosthege

pytensor/pytensor/configparser.py

Lines 68 to 86 in 21d723b

	class _SectionRedirect:
	"""Functions as a mock property on the PyTensorConfigParser.
	It redirects attribute access (to config subsectinos) to the
	new config variable properties that use "__" in their name.
	"""
	def __init__(self, root, section_name):
	self._root = root
	self._section_name = section_name
	super().__init__()
	def __getattr__(self, attr):
	warnings.warn(
	f"Accessing section '{attr}' through old .-based API. "
	f"This will be removed. Use 'config.{self._section_name}__{attr}' instead.",
	DeprecationWarning,
	)
	return getattr(self._root, f"{self._section_name}__{attr}")