update to PyO3 0.21 beta #4376

Job	Run time
build on ${{ matrix.os }} (${{ matrix.target }} - ${{ matrix.interpreter \|\| 'all' }}${{ (((matrix.os == 'linux') && format(' - {0}', (((matrix.manylinux == 'auto') && 'manylinux') \|\| matrix.manylinux))) \|\| '') }})	0s
rust benchmarks	3m 10s
build-wasm-emscripten	2m 30s
build pgo-optimized on ${{ matrix.os }} / ${{ matrix.interpreter }}	0s
build sdist	21s
coverage	2m 19s
test-debug 3.11	1m 5s
lint	1m 12s
test-debug pypy3.10	1m 32s
test MSRV	2m 34s
test on ubuntu	2m 26s
test-pydantic-integration	1m 29s
test 3.8	2m 17s
test on macos	4m 18s
test 3.9	2m 19s
test on windows	5m 2s
test 3.10	2m 22s
test 3.11	2m 19s
test 3.12	2m 48s
test pypy3.9	2m 48s
test pypy3.10	2m 55s
test build on ${{ matrix.target }}-${{ matrix.distro }}	0s
test build on ${{ matrix.os }}	0s
inspect-pypi-assets	0s
check	3s
release	0s
	45m 49s

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