Bump version to 0.5.8 #610

Job	Run time
linux-s390x (s390x-unknown-linux-gnu, s390x)	10m 48s
macos-aarch64	11m 3s
linux (x86_64-unknown-linux-gnu)	7m 55s
linux-arm (aarch64-unknown-linux-gnu, aarch64, -e JEMALLOC_SYS_WITH_LG_PAGE=16)	10m 57s
linux (i686-unknown-linux-gnu)	10m 40s
linux-arm (armv7-unknown-linux-gnueabihf, armv7)	10m 27s
sdist	9m 32s
macos-x86_64	9m 55s
linux-arm (arm-unknown-linux-musleabihf, arm)	10m 10s
windows (x86_64-pc-windows-msvc, x64)	11m 1s
linux-powerpc (powerpc64le-unknown-linux-gnu, ppc64le, -e JEMALLOC_SYS_WITH_LG_PAGE=16)	10m 50s
windows (i686-pc-windows-msvc, x86)	11m 2s
musllinux (x86_64-unknown-linux-musl)	10m 2s
linux-powerpc (powerpc64-unknown-linux-gnu, ppc64, -e JEMALLOC_SYS_WITH_LG_PAGE=16)	10m 51s
musllinux (i686-unknown-linux-musl)	10m 1s
musllinux-cross (aarch64-unknown-linux-musl, aarch64, -e JEMALLOC_SYS_WITH_LG_PAGE=16)	10m 58s
musllinux-cross (armv7-unknown-linux-musleabihf, armv7)	10m 52s
musllinux-cross (powerpc64le-unknown-linux-musl, ppc64le, -e JEMALLOC_SYS_WITH_LG_PAGE=16, nightly)	6m 48s
	3h 3m 52s

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