Upgrade to PyO3 0.26 #1077

Job	Run time
examples	27s
lint	31s
check-msrv	22s
python${{ matrix.python-version }}-${{ matrix.platform.python-architecture }} ${{ matrix.platform.os }}	0s
coverage	0s
valgrind	0s
cross-build	0s
python${{ matrix.python-version }}-${{ matrix.platform.python-architecture }} ${{ matrix.platform.os }} numpy1	0s
careful	0s
	1m 20s

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