chore: update download apis to use path #1680

Job	Run time
test / test-dart-vm (3.0.1)	2m 5s
test / test-dart-vm (stable)	2m 15s
dart2js_test / test-dart-2js (3.0.1, chrome)	4m 1s
dart2js_test / test-dart-2js (3.0.1, firefox)	4m 22s
native_test / test-dart-native (macos-latest)	2m 48s
ddc_test / test-dart-ddc (3.0.1, chrome)	3m 28s
dart2js_test / test-dart-2js (stable, chrome)	4m 11s
native_test / test-dart-native (windows-latest)	3m 15s
ddc_test / test-dart-ddc (3.0.1, firefox)	3m 34s
dart2js_test / test-dart-2js (stable, firefox)	4m 30s
ddc_test / test-dart-ddc (stable, chrome)	3m 34s
ddc_test / test-dart-ddc (stable, firefox)	3m 51s
	41m 54s

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