Bump Spin shim to Spin v2.1.0 #411

Job	Run time
rustfmt	12m 12s
build / build (ubuntu-latest, x86_64, slight, v1)	7m 49s
build-wasm-images / build_and_push (examples/spin-rust-hello, images/spin)	1m 19s
build / build (ubuntu-latest, x86_64, spin, v2)	7m 51s
build-wasm-images / build_and_push (examples/spin-dotnet-hello, images/spin_dotnet)	49s
build / build (ubuntu-latest, x86_64, wws, v1)	7m 54s
build-wasm-images / build_and_push (examples/slight-rust-hello, images/slight)	2m 31s
build / build (ubuntu-latest, x86_64, lunatic, v1)	7m 32s
build-wasm-images / build_and_push (examples/wws-js-hello, images/wws)	16s
build / build (ubuntu-latest, aarch64, slight, v1)	7m 50s
build-wasm-images / build_and_push (examples/spin-inbound-redis, images/spin-inbound-redis)	55s
build / build (ubuntu-latest, aarch64, spin, v2)	7m 49s
build-wasm-images / build_and_push (examples/spin-outbound-redis, images/spin-outbound-redis)	55s
build / build (ubuntu-latest, aarch64, wws, v1)	7m 49s
build-wasm-images / build_and_push (examples/lunatic-rust-hello, images/lunatic)	28s
build / build (ubuntu-latest, aarch64, lunatic, v1)	7m 50s
build-wasm-images / build_and_push (examples/lunatic-spawn, images/lunatic-spawn)	2m 30s
build-wasm-images / build_and_push (examples/lunatic-submillisecond, images/lunatic-submillisecond)	2m 41s
test	0s
	1h 27m 0s

Provide feedback