Bump download to v8 #246

Job	Run time
build (cpp, macos-latest)	1m 47s
build (python, macos-latest)	40s
build (js, ubuntu-latest)	1m 14s
build (rustjswasm, ubuntu-latest)	7m 41s
build (rustjswasm, macos-latest)	9m 8s
build (jupyter, macos-latest)	1m 57s
build (jupyter, ubuntu-latest)	1m 51s
build (cppjswasm, ubuntu-latest)	2m 23s
build (rust, ubuntu-latest)	5m 31s
build (js, macos-latest)	1m 30s
build (rust, macos-latest)	5m 8s
build (cpp, ubuntu-latest)	1m 23s
build (cppjswasm, macos-latest)	2m 33s
build (python, ubuntu-latest)	46s
	43m 32s

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