Keep removing pre-Python 3.9 code #582

Job	Run time
make_windows_matrix	3s
python_sdist	8s
make_linux_matrix	3s
make_run_parallel_matrix	4s
make_macos_matrix	6s
make_ios_matrix	5s
clang_TSAN	4m 13s
pytest-run-parallel (ubuntu-24.04, 3.14t)	40s
pytest-run-parallel (macos-26, 3.14t)	1m 27s
pytest-run-parallel (windows-2025, 3.14t)	2m 5s
macos (cp314t-macosx_x86_64, macos-15-intel)	12m 27s
ios (cp313-ios_arm64_iphoneos, iphoneos)	21s
ios (cp314-ios_arm64_iphonesimulator, iphonesimulator)	3m 18s
macos (cp314-macosx_x86_64, macos-15-intel)	14m 12s
ios (cp313-ios_arm64_iphonesimulator, iphonesimulator)	3m 25s
macos (cp314t-macosx_arm64, 11.0, arch -arm64 bash --noprofile --norc -eo pipefail {0})	3m 58s
macos (cp314-macosx_arm64, 11.0, arch -arm64 bash --noprofile --norc -eo pipefail {0})	3m 36s
ios (cp314-ios_arm64_iphoneos, iphoneos)	22s
windows (cp314t-win_amd64)	1m 25s
windows (cp314t-win_arm64, windows-11-arm)	2m 9s
windows (cp314-win_amd64)	1m 51s
windows (cp314t-win32)	1m 25s
windows (cp314-win_arm64, windows-11-arm)	1m 20s
windows (cp314-win32)	1m 38s
linux (cp314-manylinux_aarch64, aarch64)	4m 6s
linux (cp314t-manylinux_aarch64, aarch64)	4m 9s
linux (cp311-musllinux_i686, i686)	5m 0s
linux (cp314-musllinux_x86_64, x86_64)	5m 39s
linux (cp39-manylinux_aarch64, aarch64)	4m 14s
linux (cp314t-musllinux_x86_64, x86_64)	5m 21s
linux (cp314-manylinux_x86_64, x86_64)	4m 8s
linux (cp314t-musllinux_aarch64, aarch64)	4m 39s
linux (cp314-musllinux_aarch64, aarch64)	4m 37s
linux (cp313-manylinux_i686, i686)	4m 29s
linux (cp314t-manylinux_x86_64, x86_64)	4m 21s
merge_artifacts	0s
check	3s
	1h 51m 7s

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