Bump default maturin version 1.5.1 -> 1.6.0 #716

Job	Run time
Clippy	16s
poetry-linting (application)	32s
Rustfmt	14s
poetry-linting (lib)	26s
poetry-test (application, ubuntu-latest)	33s
pyo3-linting (application)	1m 1s
poetry-test (application, macos-latest)	45s
pyo3-python-test (application, ubuntu-latest)	1m 9s
pyo3-linting (lib)	1m 2s
poetry-test (lib, ubuntu-latest)	31s
pyo3-python-test (application, macos-latest)	52s
poetry-test (lib, macos-latest)	1m 35s
pyo3-python-test (lib, ubuntu-latest)	47s
setuptools-linting (application)	30s
pyo3-python-test (lib, macos-latest)	1m 0s
setuptools-linting (lib)	31s
setuptools-test (application, ubuntu-latest)	33s
setuptools-test (application, macos-latest)	39s
Tests	21s
setuptools-test (lib, ubuntu-latest)	1m 4s
setuptools-test (lib, macos-latest)	40s
	15m 1s

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