Add missing dep for windows/conda enum_tools #953

Job	Run time
lint/style-and-typos	39s
linux/3.12	17m 13s
linux/3.8/bare-env	11s
osx/3.10	19m 6s
win/3.9	43m 51s
linux/3.11/conda	20m 12s
linux/3.9/mpi	8m 56s
linux/3.10/cython	20m 28s
win/3.8/pip	29m 21s
process-coverage-${{ matrix.TARGET }}	0s
	2h 39m 57s

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