deps: add pooch as test dependency in conda build

[jokasimr]

No description provided.

[YooSunYoung]

esssans/tests/package_test.py

Lines 3 to 9 in a246f32

	import pytest
	from ess import isissans, loki, sans
	@pytest.mark.parametrize('pkg', [sans, loki, isissans])
	def test_has_version(pkg):
	assert hasattr(pkg, '__version__')

I guess we need to do 3 of them separately...?

or install pytest manually in the action.

[jokasimr]

esssans/tests/package_test.py

Lines 3 to 9 in a246f32

	import pytest
	from ess import isissans, loki, sans
	@pytest.mark.parametrize('pkg', [sans, loki, isissans])
	def test_has_version(pkg):
	assert hasattr(pkg, '__version__')

I guess we need to do 3 of them separately...?

or install pytest manually in the action.

Three separately sounds like a good solution