Python 3.12 support / imp module deleted #1944

Job	Run time
cpp_build (ubuntu-latest)	1m 55s
cpp_build (windows-latest)	2m 36s
py_build_test (ubuntu-latest, 3.7)	2m 47s
cpp_build (macos-latest)	2m 45s
py_build_test (ubuntu-latest, 3.8)	2m 46s
py_build_test (ubuntu-latest, 3.9)	2m 48s
py_build_test (ubuntu-latest, 3.10)	2m 48s
py_build_test (ubuntu-latest, 3.11)	2m 48s
py_build_test (ubuntu-latest, 3.12)	2m 45s
py_build_test (windows-latest, 3.7)	2m 35s
py_build_test (windows-latest, 3.8)	2m 43s
py_build_test (windows-latest, 3.9)	2m 33s
py_build_test (windows-latest, 3.10)	2m 39s
py_build_test (windows-latest, 3.11)	2m 32s
py_build_test (windows-latest, 3.12)	2m 36s
py_build_test (macos-latest, 3.7)	2m 42s
py_build_test (macos-latest, 3.8)	2m 44s
py_build_test (macos-latest, 3.9)	2m 49s
py_build_test (macos-latest, 3.10)	2m 45s
py_build_test (macos-latest, 3.11)	2m 44s
py_build_test (macos-latest, 3.12)	2m 45s
py_build_test (windows-latest, mingw64, msys2)	2m 38s
package_wheels	1s
package_sdist	1s
	58m 45s

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