Test building site with conda environment

Bump conda-incubator/setup-miniconda from 3.0.4 to 3.1.0 in /.github/workflows in the actions group #244

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Run time

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Job	Run time
test (ubuntu)	1m 44s
test (macos)	2m 33s
test (windows)	5m 39s
	9m 56s