Update emsdk to 3.1.55 #97

Job	Run time
build-wasm	1m 29s
test-native (ubuntu-latest, 18.x)	1m 25s
test-native (ubuntu-latest, 20.x)	1m 22s
test-native (ubuntu-latest, 21.x)	1m 41s
test-native (macOS-latest, 18.x)	3m 13s
test-native (macOS-latest, 20.x)	2m 24s
test-native (macOS-latest, 21.x)	2m 50s
test-native (windows-latest, 18.x)	2m 52s
test-native (windows-latest, 20.x)	2m 40s
test-native (windows-latest, 21.x)	2m 28s
build-web	5s
test-wasm (ubuntu-latest, 18.x)	4m 55s
test-wasm (ubuntu-latest, 20.x)	5m 38s
test-wasm (ubuntu-latest, 21.x)	5m 5s
test-wasm (macOS-latest, 18.x)	4m 2s
test-wasm (macOS-latest, 20.x)	4m 4s
test-wasm (macOS-latest, 21.x)	14m 59s
test-wasm (windows-latest, 18.x)	6m 42s
test-wasm (windows-latest, 20.x)	7m 49s
test-wasm (windows-latest, 21.x)	7m 30s
test-web (deno, ubuntu-latest)	3m 55s
test-web (deno, macOS-latest)	4m 49s
test-web (deno, windows-latest)	4m 28s
test-web (chrome, ubuntu-latest)	4m 28s
test-web (chrome, macOS-latest)	5m 9s
test-web (chrome, windows-latest)	6m 0s
	1h 52m 2s

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