Bump Spin shim to Spin v2.1.0 #420

Job	Run time
rustfmt	12m 38s
build / build (ubuntu-latest, x86_64, slight, v1)	17m 44s
build-wasm-images / build_and_push (examples/spin-rust-hello, images/spin)	1m 20s
build / build (ubuntu-latest, x86_64, spin, v2)	20m 10s
build-wasm-images / build_and_push (examples/spin-dotnet-hello, images/spin_dotnet)	57s
build / build (ubuntu-latest, x86_64, wws, v1)	13m 39s
build-wasm-images / build_and_push (examples/slight-rust-hello, images/slight)	2m 55s
build / build (ubuntu-latest, x86_64, lunatic, v1)	11m 39s
build-wasm-images / build_and_push (examples/wws-js-hello, images/wws)	10s
build / build (ubuntu-latest, aarch64, slight, v1)	18m 51s
build-wasm-images / build_and_push (examples/spin-inbound-redis, images/spin-inbound-redis)	1m 31s
build / build (ubuntu-latest, aarch64, spin, v2)	21m 12s
build-wasm-images / build_and_push (examples/spin-outbound-redis, images/spin-outbound-redis)	53s
build / build (ubuntu-latest, aarch64, wws, v1)	16m 10s
build-wasm-images / build_and_push (examples/lunatic-rust-hello, images/lunatic)	39s
build / build (ubuntu-latest, aarch64, lunatic, v1)	13m 15s
build-wasm-images / build_and_push (examples/lunatic-spawn, images/lunatic-spawn)	2m 46s
build-wasm-images / build_and_push (examples/lunatic-submillisecond, images/lunatic-submillisecond)	3m 47s
test	11m 9s
	2h 51m 25s

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