Update to C++23 #1628

Job	Run time
Build ubuntu-20.04-g++-10	23s
Build ubuntu-22.04-g++-11	5m 9s
Build ubuntu-22.04-g++-12	6m 8s
Build ubuntu-20.04-clang-11	14s
Build ubuntu-22.04-clang-12	16s
Build ubuntu-22.04-clang-12	18s
Copy the font files	5s
Build ubuntu-22.04-clang-12	18s
Set up and cache emscripten	16s
Build ubuntu-22.04-clang-13	9s
Build ubuntu-22.04-clang-14	6s
Build ubuntu-22.04-clang-11	24s
Build ubuntu-22.04-clang-15	15s
Build macos-latest-xcode-15.4	8s
Build macos-latest-g++-12	5m 43s
Build JS toolkit (nohumdrum, Building toolkit without humdrum, -c -H -M, verovio-toolkit.js*)	6m 58s
Build JS toolkit (light, Building toolkit without humdrum as light version, -c -H -l -M, verovio-...	6m 54s
Build JS toolkit (wasm, Building toolkit without humdrum as wasm, -c -H -w -M, veroviowasm, true)	5m 54s
Build JS toolkit (default, Building default toolkit with humdrum, -c -M, -hum.js)	8m 57s
Check settings for deployment	0s
Build documentation	0s
Deploy JS toolkit	0s
Deploy documentation	0s
Skip deployment if set	0s
	48m 35s

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