repos: force SSH for GitHub clone URLs #111

Job	Run time
build-linux-host-simd	5m 34s
build (x86_64-apple-darwin, macos-latest)	2m 42s
build (aarch64-unknown-linux-gnu, ubuntu-latest)	4m 3s
build (aarch64-apple-darwin, macos-latest)	3m 56s
build (x86_64-unknown-linux-gnu, ubuntu-latest)	2m 11s
release	19s
	18m 45s

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