Bump pyo3 from 0.20.2 to 0.20.3 #128

Job	Run time
windows (x64)	1m 8s
linux-cross (aarch64)	3m 32s
windows (x86)	1m 28s
linux (x86_64)	1m 11s
linux-cross (armv7)	3m 45s
macos	1m 18s
linux (i686)	1m 16s
linux-cross (s390x)	3m 20s
musllinux (x86_64-unknown-linux-musl)	56s
linux-cross (ppc64le)	3m 28s
musllinux-cross (aarch64-unknown-linux-musl, aarch64)	1m 32s
musllinux (i686-unknown-linux-musl)	52s
linux-cross (ppc64)	1m 39s
musllinux-cross (armv7-unknown-linux-musleabihf, armv7)	1m 32s
Release	0s
	26m 57s

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