ci: pin cross and rust versions #415

Job	Run time
rustfmt	10m 11s
build / build (ubuntu-latest, x86_64, spin, v2)	8m 58s
build-wasm-images / build_and_push (examples/spin-rust-hello, images/spin)	1m 25s
build / build (ubuntu-latest, x86_64, wws, v1)	8m 57s
build-wasm-images / build_and_push (examples/spin-dotnet-hello, images/spin_dotnet)	59s
build / build (ubuntu-latest, x86_64, lunatic, v1)	8m 37s
build-wasm-images / build_and_push (examples/slight-rust-hello, images/slight)	2m 51s
build / build (ubuntu-latest, aarch64, spin, v2)	8m 56s
build-wasm-images / build_and_push (examples/wws-js-hello, images/wws)	15s
build / build (ubuntu-latest, aarch64, wws, v1)	8m 57s
build-wasm-images / build_and_push (examples/spin-inbound-redis, images/spin-inbound-redis)	1m 19s
build / build (ubuntu-latest, aarch64, lunatic, v1)	8m 57s
build-wasm-images / build_and_push (examples/spin-outbound-redis, images/spin-outbound-redis)	1m 6s
build-wasm-images / build_and_push (examples/lunatic-rust-hello, images/lunatic)	41s
build-wasm-images / build_and_push (examples/lunatic-spawn, images/lunatic-spawn)	2m 40s
build-wasm-images / build_and_push (examples/lunatic-submillisecond, images/lunatic-submillisecond)	3m 8s
test	0s
	1h 17m 57s

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