Python 2 and dependency on future

[frenzymadness]

Hi. I see future in the list of dependencies and I've found only this one usage of it:

autograd/examples/data_mnist.py

Lines 4 to 6 in e18f656

	if sys.version < "3":
	from future.standard_library import install_aliases
	install_aliases()

Do you still need to support Python 2? I'm asking because future is broken with the latest Python 3.12 and will be even more with 3.13 so it might be a good idea to get rid of it.

[musicinmybrain]

This appears to be fixed in unreleased commit 55e3373, which conditionalizes the dependency on the Python interpreter version and replaces most uses of future with six. When I run tox -e py313 on current master, 9a90bd6, I get only one test failure in test_wrapped_name_and_docs (which is due to the new behavior of stripping indentation from docstrings).

[musicinmybrain]

test_wrapped_name_and_docs

#619