cargo: point `repository` metadata to clonable URLs #278

Job	Run time
build (1.73.0, thumbv7em-none-eabi)	18s
cross (armv7-unknown-linux-gnueabihf, 1.73.0)	1m 44s
build (1.73.0, wasm32-unknown-unknown)	19s
doc	52s
cross (armv7-unknown-linux-gnueabihf, stable)	1m 31s
build (stable, thumbv7em-none-eabi)	15s
cross (aarch64-unknown-linux-gnu, 1.73.0)	1m 24s
build (stable, wasm32-unknown-unknown)	24s
cross (aarch64-unknown-linux-gnu, stable)	1m 12s
test (i686-unknown-linux-gnu, 1.73.0, sudo apt update && sudo apt install gcc-multilib)	1m 33s
cross (powerpc-unknown-linux-gnu, 1.73.0)	1m 33s
test (i686-unknown-linux-gnu, stable, sudo apt update && sudo apt install gcc-multilib)	1m 7s
cross (powerpc-unknown-linux-gnu, stable)	1m 20s
test (x86_64-unknown-linux-gnu, 1.73.0)	58s
test (x86_64-unknown-linux-gnu, stable)	52s
	15m 22s

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