Bump version to 3.0.0 #29

Job	Run time
Build on linux (x86_64 - auto)	2m 39s
Build on linux (aarch64 - auto)	2m 46s
build_sdist	13s
Build on macos (x86_64 - auto)	5m 22s
Build on macos (aarch64 - auto)	2m 48s
Build on windows (x86_64 - auto)	4m 38s
Build on windows (aarch64 - auto)	4m 49s
Build on linux (x86_64 - musllinux_1_1)	2m 14s
Build on linux (aarch64 - musllinux_1_1)	2m 14s
Build on linux (ppc64le - auto)	2m 10s
Build on linux (s390x - auto)	2m 28s
Release	58s
	33m 19s

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