Bump `hybrid-array` depenency to v0.2.0-pre.7 (#1028) #1571

Job	Run time
build (1.41.0, thumbv7em-none-eabi)	12s
build (1.41.0, wasm32-unknown-unknown)	11s
build (stable, thumbv7em-none-eabi)	17s
build (stable, wasm32-unknown-unknown)	14s
test (1.41.0)	14s
test (stable)	17s
minimal-versions / minimal-versions	27s
	1m 52s

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