Bump version to 0.4.9 #489

Job	Run time
macos-x86_64	9m 43s
sdist	8m 5s
windows (x86_64-pc-windows-msvc, x64)	15m 12s
windows (i686-pc-windows-msvc, x86)	16m 5s
linux (x86_64-unknown-linux-gnu)	8m 28s
linux-arm (aarch64-unknown-linux-gnu, aarch64, -e JEMALLOC_SYS_WITH_LG_PAGE=16)	9m 40s
linux-powerpc (powerpc64le-unknown-linux-gnu, ppc64le)	9m 37s
linux (i686-unknown-linux-gnu)	12m 20s
linux-arm (armv7-unknown-linux-gnueabihf, armv7)	8m 27s
linux-powerpc (powerpc64-unknown-linux-gnu, ppc64)	9m 12s
linux-s390x (s390x-unknown-linux-gnu, s390x)	13m 29s
linux-arm (arm-unknown-linux-musleabihf, arm)	8m 2s
macos-aarch64	7m 52s
musllinux (x86_64-unknown-linux-musl)	8m 39s
musllinux-cross (aarch64-unknown-linux-musl, aarch64, -e JEMALLOC_SYS_WITH_LG_PAGE=16)	9m 50s
musllinux (i686-unknown-linux-musl)	8m 15s
musllinux-cross (armv7-unknown-linux-musleabihf, armv7)	8m 47s
musllinux-cross (powerpc64le-unknown-linux-musl, ppc64le, nightly)	54s
	2h 52m 37s

Provide feedback