deps: update to pyo3 0.27 (#290) #994

Job	Run time
Clippy	1m 16s
Check rustdoc intra-doc links	36s
Rustfmt	17s
Check	1m 37s
Test Suite	1m 47s
Cross compile (armv7-unknown-linux-gnueabihf)	20s
Cross compile (powerpc64-unknown-linux-gnu)	21s
Cross compile (powerpc-unknown-linux-gnu)	23s
Cross compile (wasm32-unknown-unknown)	18s
	6m 55s

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