deprecate py3.9 #153

Job	Run time
linux (x86_64-unknown-linux-gnu)	1m 33s
linux (i686-unknown-linux-gnu)	2m 4s
linux-cross (aarch64-unknown-linux-gnu, aarch64, -e JEMALLOC_SYS_WITH_LG_PAGE=16)	1m 52s
macos-universal	1m 20s
linux-cross (armv7-unknown-linux-gnueabihf, armv7)	1m 51s
linux-cross (s390x-unknown-linux-gnu, s390x)	2m 0s
linux-cross (powerpc64le-unknown-linux-gnu, ppc64le)	1m 49s
macos-x86_64	55s
linux-cross (powerpc64-unknown-linux-gnu, ppc64)	1m 56s
musllinux (x86_64-unknown-linux-musl)	1m 23s
musllinux-cross (aarch64-unknown-linux-musl, aarch64, -e JEMALLOC_SYS_WITH_LG_PAGE=16)	1m 21s
musllinux (i686-unknown-linux-musl)	1m 11s
musllinux-cross (armv7-unknown-linux-musleabihf, armv7)	1m 10s
windows (x86_64-pc-windows-msvc)	2m 40s
windows (i686-pc-windows-msvc)	2m 50s
windows (aarch64-pc-windows-msvc)	4m 42s
Release	0s
	30m 37s

Provide feedback