Start removing pre-Python 3.8 code #503

Job	Run time
python_sdist	17s
make_linux_matrix	3s
make_ios_matrix	5s
make_macos_matrix	6s
make_windows_matrix	4s
clang_TSAN	3m 11s
make_run_parallel_matrix	7s
pytest-run-parallel (windows-2025, 3.14t)	1m 40s
pytest-run-parallel (ubuntu-24.04, 3.14t)	29s
pytest-run-parallel (macos-15, 3.14t)	58s
macos (cp314t-macosx_arm64, 11.0, arch -arm64 bash --noprofile --norc -eo pipefail {0})	55s
macos (cp314-macosx_arm64, 11.0, arch -arm64 bash --noprofile --norc -eo pipefail {0})	32s
ios (cp313-ios_arm64_iphonesimulator, iphonesimulator)	5m 3s
ios (cp314-ios_arm64_iphoneos, iphoneos)	20s
ios (cp313-ios_arm64_iphoneos, iphoneos)	23s
macos (cp314t-macosx_x86_64, macos-15-intel)	2m 1s
windows (cp314-win32)	1m 34s
windows (cp314t-win_amd64)	1m 34s
macos (cp314-macosx_x86_64, macos-15-intel)	50s
windows (cp314-win_amd64)	1m 19s
windows (cp314t-win_arm64, windows-11-arm)	1m 45s
windows (cp314t-win32)	1m 27s
linux (cp311-musllinux_i686, i686)	1m 7s
linux (cp314t-musllinux_x86_64, x86_64)	1m 3s
windows (cp314-win_arm64, windows-11-arm)	1m 51s
linux (cp314-manylinux_x86_64, x86_64)	1m 4s
ios (cp314-ios_arm64_iphonesimulator, iphonesimulator)	4m 49s
linux (cp313-manylinux_i686, i686)	1m 8s
linux (cp39-manylinux_aarch64, aarch64)	1m 8s
linux (cp314t-manylinux_x86_64, x86_64)	58s
linux (cp314-musllinux_x86_64, x86_64)	1m 6s
linux (cp314t-manylinux_aarch64, aarch64)	1m 12s
linux (cp314t-musllinux_aarch64, aarch64)	1m 13s
linux (cp314-musllinux_aarch64, aarch64)	1m 13s
linux (cp314-manylinux_aarch64, aarch64)	1m 8s
check	5s
merge_artifacts	0s
	43m 48s

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