Bump Spin shim to Spin v2.1.0 #409

Job	Run time
rustfmt	12m 0s
build-wasm-images / build_and_push (examples/spin-rust-hello, images/spin)	1m 25s
build / build (ubuntu-latest, x86_64, slight, v1)	8m 7s
build-wasm-images / build_and_push (examples/spin-dotnet-hello, images/spin_dotnet)	48s
build / build (ubuntu-latest, x86_64, spin, v2)	8m 8s
build-wasm-images / build_and_push (examples/slight-rust-hello, images/slight)	2m 27s
build / build (ubuntu-latest, x86_64, wws, v1)	8m 6s
build-wasm-images / build_and_push (examples/wws-js-hello, images/wws)	8s
build / build (ubuntu-latest, x86_64, lunatic, v1)	7m 49s
build-wasm-images / build_and_push (examples/spin-inbound-redis, images/spin-inbound-redis)	55s
build / build (ubuntu-latest, aarch64, slight, v1)	8m 7s
build-wasm-images / build_and_push (examples/spin-outbound-redis, images/spin-outbound-redis)	1m 3s
build / build (ubuntu-latest, aarch64, spin, v2)	8m 6s
build-wasm-images / build_and_push (examples/lunatic-rust-hello, images/lunatic)	36s
build / build (ubuntu-latest, aarch64, wws, v1)	8m 7s
build-wasm-images / build_and_push (examples/lunatic-spawn, images/lunatic-spawn)	2m 37s
build / build (ubuntu-latest, aarch64, lunatic, v1)	8m 6s
build-wasm-images / build_and_push (examples/lunatic-submillisecond, images/lunatic-submillisecond)	2m 46s
test	0s
	1h 29m 21s

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