Updated pyo3 to 0.23 #1270

Job	Run time
tests-argmin	2m 57s
tests-argmin-checkpointing-file	26s
tests-argmin-observer-paramwriter	32s
tests-argmin-observer-slog	30s
tests-argmin-observer-spectator	1m 39s
tests-argmin-serde1-feature	1m 52s
tests-argmin-testfunctions	34s
cargo-deny (advisories)	36s
cargo-deny (bans licenses sources)	41s
clippy	3m 10s
docs-build	1m 2s
rustfmt	30s
tests-argmin-math	3m 43s
tests-finitediff	34s
wasm-build	54s
	19m 40s

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