CI: install blosc2 #312

Job	Run time
test-ubuntu-system-python (ubuntu-latest)	39m 43s
build (macos-latest, 3.9)	4m 25s
build (ubuntu-latest, 3.9)	2m 33s
build (ubuntu-latest, 3.x)	39s
build (windows-latest, 3.9)	3m 46s
build (windows-latest, 3.x)	1m 2s
build (macos-latest, 3.x)	51s
	52m 59s

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