Bump emsdk action to 16 #225

Job	Run time
build (jupyter, ubuntu-latest)	1m 53s
build (cpp, macos-latest)	1m 25s
build (python, macos-latest)	41s
build (js, ubuntu-latest)	1m 19s
build (python, ubuntu-latest)	46s
build (jupyter, macos-latest)	1m 54s
build (cpp, ubuntu-latest)	1m 30s
build (rustjswasm, macos-latest)	8m 18s
build (rust, macos-latest)	6m 31s
build (js, macos-latest)	1m 19s
build (rust, ubuntu-latest)	5m 47s
build (rustjswasm, ubuntu-latest)	8m 3s
build (cppjswasm, macos-latest)	2m 15s
build (cppjswasm, ubuntu-latest)	2m 29s
	44m 10s

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