cargo: point `repository` metadata to clonable URLs #88

Job	Run time
no_std (1.65.0, thumbv7em-none-eabi)	1m 3s
test (1.65.0)	1m 6s
no_std (1.65.0, wasm32-unknown-unknown)	1m 5s
test (1.65.0, serde)	1m 13s
no_std (stable, thumbv7em-none-eabi)	16s
test (1.65.0, secret)	1m 18s
no_std (stable, wasm32-unknown-unknown)	5s
test (1.65.0, json)	1m 13s
test (1.65.0, serde,secret)	1m 11s
test (1.65.0, serde,json)	1m 17s
test (1.65.0, secret,json)	1m 19s
test (1.65.0, serde,secret,json)	1m 16s
test (stable)	6s
test (stable, serde)	13s
test (stable, secret)	11s
test (stable, json)	11s
test (stable, serde,secret)	22s
test (stable, serde,json)	11s
test (stable, secret,json)	12s
test (stable, serde,secret,json)	10s
minimal-versions / minimal-versions	30s
	14m 28s

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