cargo: point `repository` metadata to clonable URLs (#68) #99

Job	Run time
no_std (1.65.0, thumbv7em-none-eabi)	1m 12s
no_std (1.65.0, wasm32-unknown-unknown)	1m 11s
test (1.65.0)	1m 12s
no_std (stable, thumbv7em-none-eabi)	11s
test (stable)	12s
no_std (stable, wasm32-unknown-unknown)	14s
minimal-versions / minimal-versions	22s
	4m 34s

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