Remove extension-module feature #68

Job	Run time
sdist	9s
musllinux (ubuntu-22.04, aarch64)	3m 38s
windows (windows-latest, x64, x64)	4m 5s
musllinux (ubuntu-22.04, x86)	2m 56s
windows (windows-11-arm, aarch64, arm64)	2m 12s
windows (windows-latest, x86, x86)	2m 11s
macos (macos-15-intel, x86_64)	2m 6s
macos (macos-latest, aarch64)	1m 10s
musllinux (ubuntu-22.04, x86_64)	3m 13s
musllinux (ubuntu-22.04, armv7)	3m 43s
linux (ubuntu-22.04, aarch64)	5m 35s
linux (ubuntu-22.04, armv7)	5m 49s
linux (ubuntu-22.04, ppc64le)	5m 41s
linux (ubuntu-22.04, s390x)	5m 37s
linux (ubuntu-22.04, x86_64)	2m 28s
linux (ubuntu-22.04, x86)	4m 22s
Release	0s
	54m 55s

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