Bump `hybrid-array` to v0.2.0-pre.6 #1415

Job	Run time
build (1.65.0, thumbv7em-none-eabi)	16s
build (1.65.0, wasm32-unknown-unknown)	13s
build (stable, thumbv7em-none-eabi)	18s
build (stable, wasm32-unknown-unknown)	18s
test (1.65.0)	17s
test (stable)	20s
minimal-versions / minimal-versions	36s
	2m 18s

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