cargo: point `repository` metadata to clonable URLs #59

Job	Run time
build (1.73.0, thumbv7em-none-eabi)	14s
build (1.73.0, wasm32-unknown-unknown)	13s
build (stable, thumbv7em-none-eabi)	7s
doc	9s
build (stable, wasm32-unknown-unknown)	10s
test (1.73.0)	13s
test (stable)	5s
	1m 11s

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