fix hatch-cpp version in cppjswasm template #190

Job	Run time
build (cpp, ubuntu-latest)	1m 36s
build (cpp, macos-latest)	1m 52s
build (python, ubuntu-latest)	1m 0s
build (js, ubuntu-latest)	1m 28s
build (python, macos-latest)	55s
build (cppjswasm, macos-latest)	3m 4s
build (cppjswasm, ubuntu-latest)	2m 24s
build (rust, macos-latest)	6m 51s
build (rustjswasm, ubuntu-latest)	14m 32s
build (js, macos-latest)	1m 39s
build (rust, ubuntu-latest)	5m 52s
build (rustjswasm, macos-latest)	10m 49s
build (jupyter, ubuntu-latest)	2m 0s
build (jupyter, macos-latest)	2m 22s
	56m 24s

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