Bump Spin shim to Spin v2.1.0 #418

Job	Run time
rustfmt	12m 6s
build-wasm-images / build_and_push (examples/spin-rust-hello, images/spin)	1m 25s
build / build (ubuntu-latest, x86_64, slight, v1)	17m 53s
build-wasm-images / build_and_push (examples/spin-dotnet-hello, images/spin_dotnet)	49s
build / build (ubuntu-latest, x86_64, spin, v2)	21m 57s
build-wasm-images / build_and_push (examples/slight-rust-hello, images/slight)	2m 42s
build / build (ubuntu-latest, x86_64, wws, v1)	14m 24s
build-wasm-images / build_and_push (examples/wws-js-hello, images/wws)	17s
build / build (ubuntu-latest, x86_64, lunatic, v1)	12m 22s
build-wasm-images / build_and_push (examples/spin-inbound-redis, images/spin-inbound-redis)	56s
build / build (ubuntu-latest, aarch64, slight, v1)	19m 23s
build-wasm-images / build_and_push (examples/spin-outbound-redis, images/spin-outbound-redis)	54s
build / build (ubuntu-latest, aarch64, spin, v2)	21m 57s
build-wasm-images / build_and_push (examples/lunatic-rust-hello, images/lunatic)	31s
build / build (ubuntu-latest, aarch64, wws, v1)	14m 58s
build-wasm-images / build_and_push (examples/lunatic-spawn, images/lunatic-spawn)	2m 43s
build / build (ubuntu-latest, aarch64, lunatic, v1)	12m 35s
build-wasm-images / build_and_push (examples/lunatic-submillisecond, images/lunatic-submillisecond)	2m 43s
test	10m 21s
	2h 50m 56s

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