Update all dependencies

This MR contains the following updates:

Package	Type	Update	Change
Cerberus (source)	ironbank-pypi	patch	1.3.2 -> 1.3.4
Sphinx (source)	ironbank-pypi	minor	4.4.0 -> 4.5.0
pytest_testinfra	ironbank-pypi	minor	6.6.0 -> 6.7.0

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#35 (closed)

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