Bump version to 0.4.9 #493

Job	Run time
windows (x86_64-pc-windows-msvc, x64)	15m 14s
windows (i686-pc-windows-msvc, x86)	15m 18s
macos-x86_64	9m 33s
sdist	7m 26s
macos-aarch64	8m 26s
linux-powerpc (powerpc64le-unknown-linux-gnu, ppc64le)	9m 22s
linux (x86_64-unknown-linux-gnu)	8m 30s
linux (i686-unknown-linux-gnu)	12m 21s
linux-arm (aarch64-unknown-linux-gnu, aarch64, -e JEMALLOC_SYS_WITH_LG_PAGE=16)	9m 25s
linux-arm (armv7-unknown-linux-gnueabihf, armv7)	8m 23s
linux-powerpc (powerpc64-unknown-linux-gnu, ppc64)	9m 18s
linux-arm (arm-unknown-linux-musleabihf, arm)	8m 24s
linux-s390x (s390x-unknown-linux-gnu, s390x)	13m 41s
musllinux (x86_64-unknown-linux-musl)	8m 29s
musllinux-cross (aarch64-unknown-linux-musl, aarch64, -e JEMALLOC_SYS_WITH_LG_PAGE=16)	9m 40s
musllinux (i686-unknown-linux-musl)	7m 55s
musllinux-cross (armv7-unknown-linux-musleabihf, armv7)	8m 32s
musllinux-cross (powerpc64le-unknown-linux-musl, ppc64le, nightly)	6m 58s
	2h 56m 55s

Provide feedback