enlève la dépendance à pytest, doublon avec openfisca-survey-manager #334

Job	Run time
build (ubuntu-20.04, 3.9.9)	6m 5s
build (ubuntu-20.04, 3.10.6)	5m 56s
coverage	2m 38s
test-python (ubuntu-20.04, 3.9.9)	2m 0s
test-python (ubuntu-20.04, 3.10.6)	5m 21s
lint-files	27s
check-version-and-changelog	11s
check-for-functional-changes	0s
build-conda	0s
deploy	0s
test-on-windows	0s
publish-to-conda	0s
	22m 38s

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