Emscripten

ci(coverage): update to gcovr 7.0 (#1070) #1022

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Run time

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Job	Run time
Emscripten-C++14-Release-static	3m 24s
Emscripten-C++17-Release-static	3m 14s
Emscripten-C++20-Release-static	3m 34s
Emscripten-C++23-Release-static	3m 32s
Emscripten-C++14-Debug-static	3m 21s
Emscripten-C++17-Debug-static	3m 26s
Emscripten-C++20-Debug-static	3m 38s
Emscripten-C++23-Debug-static	3m 33s
	27m 42s