Update to require at least C++17 #573

Job	Run time
coverage	8m 2s
test-python (ubuntu-20.04, gcc-9, g++-9, 3.8)	4m 32s
test-python (ubuntu-22.04, gcc-12, g++-12, 3.12.0-rc.1)	5m 28s
test-python (ubuntu-20.04, clang-10, clang++-10, 3.12.0-rc.1)	3m 59s
test-python (ubuntu-22.04, clang-14, clang++-14, 3.12.0-rc.1)	3m 50s
test-python (macos-12, clang, clang++, 3.12.0-rc.1)	10m 9s
test-cxx (ubuntu-20.04, g++-9, yes)	5m 39s
test-cxx (ubuntu-22.04, g++-12, yes)	4m 41s
test-cxx (ubuntu-20.04, clang++-10, yes)	4m 52s
test-cxx (ubuntu-22.04, clang++-14, yes)	3m 55s
test-cxx (macos-12, clang++, no)	5m 7s
cibuildwheel	16m 27s
sdist	41s
	1h 17m 22s

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