Revert "wasm32-unknown-unknown -> wasm32-wasip1 in rust-toolchain" #411

Job	Run time
test-c-and-cxx-bindings (ubuntu-latest)	1m 13s
test-rust-wasi	42s
test-c-and-cxx-bindings (macos-latest)	1m 5s
test-rust (stable)	5m 50s
test-python (3.9)	50s
test-rust (nightly)	38s
test-python (3.x)	46s
test-webgpu	3m 55s
benchmark (new)	1m 42s
coverage	6m 52s
benchmark (old)	1m 33s
fuzz-afl	3m 1s
fuzz-honggfuzz	1m 26s
fuzz-libfuzzer	2m 18s
test-wasm (18.x)	1m 16s
actionlint	6s
build-and-deploy-grpc-server	3m 19s
build-and-deploy-http-server	3m 14s
test-wasm (latest)	1m 24s
check-js	9s
deploy-cloudflare-worker	3m 31s
gist-mapping	59s
compare-benchmarks	5s
deploy-site	3m 35s
	49m 29s

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