cargo: point `repository` metadata to clonable URLs #98

Job	Run time
no_std (1.65.0, thumbv7em-none-eabi)	1m 14s
no_std (1.65.0, wasm32-unknown-unknown)	1m 14s
no_std (stable, thumbv7em-none-eabi)	28s
no_std (stable, wasm32-unknown-unknown)	11s
test (1.65.0)	1m 15s
test (stable)	11s
minimal-versions / minimal-versions	27s
	5m 0s

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