Emscripten

ci(macos): switch to macos-13 runner #1221

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Run time

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Job	Run time
Emscripten-C++14-Release-static	2m 55s
Emscripten-C++17-Release-static	2m 59s
Emscripten-C++20-Release-static	3m 10s
Emscripten-C++23-Release-static	3m 4s
Emscripten-C++14-Debug-static	2m 48s
Emscripten-C++17-Debug-static	3m 1s
Emscripten-C++20-Debug-static	3m 15s
Emscripten-C++23-Debug-static	3m 10s
	24m 22s