Unwrap the underlying PyErr when converting an io::Error back to a PyErr #6678

Job	Run time
fmt	25s
emscripten	0s
check-msrv	11m 17s
python${{ matrix.python-version }}-${{ matrix.platform.python-architecture }} ${{ matrix.platform.os }} rust-${{ matrix.rust }}	0s
clippy/x86_64-apple-darwin/stable	20m 20s
clippy/x86_64-unknown-linux-gnu/stable	15m 48s
clippy/powerpc64le-unknown-linux-gnu/stable	14m 8s
clippy/s390x-unknown-linux-gnu/stable	11m 38s
clippy/wasm32-wasi/stable	13m 24s
clippy/x86_64-pc-windows-msvc/stable	19m 0s
clippy/i686-pc-windows-msvc/stable	15m 16s
careful	0s
coverage-windows	4s
coverage-macos	6s
coverage-ubuntu	23m 42s
valgrind	0s
python3.11-x64 macos-latest rust-stable / build	19m 52s
python3.11-x64 ubuntu-latest rust-stable / build	11m 44s
python3.11-x64 windows-latest rust-stable / build	26m 7s
python3.11-x86 windows-latest rust-stable / build	18m 22s
conclusion	1s
	3h 41m 14s

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