revert addition of `future`: #2561

Job	Run time
Generate wheels matrix	5s
Production release, Zenodo publication	0s
Non publication, Zenodo skip	1s
Build source distribution	26s
Build wheels on cp313-manylinux_x86_64	4m 9s
Build wheels on cp313-win_amd64	6m 31s
Build wheels on cp313-win_arm64	2m 35s
Build wheels on cp313-macosx_x86_64	4m 33s
Build wheels on cp313-macosx_arm64	2m 21s
Upload to PyPI	0s
Upload to Test_PyPI	0s
Upload binary wheels and sdist to GH release page	0s
	20m 41s

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