Update dependency Cerberus to v1.3.4

This MR contains the following updates:

Package	Type	Update	Change
Cerberus (source)	ironbank-pypi	patch	1.3.2 -> 1.3.4

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Release Notes

pyeve/cerberus

v1.3.4

Compare Source

Released on May 5, 2021.

Fixed

- Reverts the unsatisfying fix for `#557`_,
- instead a ``RuntimeError`` is thrown when Python is running with optimization
  level 2 (`#567`_)

.. _`#567`: https://github.com/pyeve/cerberus/issues/567

v1.3.3

Compare Source

Released on April 11, 2021.

New

- Adds a benchmark to observe overall performance between code changes (`#531`_)
- Adds support for Python 3.9
- The Continuous Integration now runs on GitHub Actions

Fixed

• Fixed unresolved registry references when getting a constraint for an error (#562_)
• Fixed crash when submitting non-hashable values to allowed (#524_)
• Fixed schema validation for rules specifications with space (#527_)
• Replaced deprecated rule name validator with check_with in the docs (#527_)
• Use the UnconcernedValidator when the Python interpreter is executed with an optimization flag (#557_)
• Several fixes and refinements of the docs

.. _#524: https://github.com/pyeve/cerberus/issues/524 .. _#527: https://github.com/pyeve/cerberus/issues/527 .. _#531: https://github.com/pyeve/cerberus/issues/531 .. _#557: https://github.com/pyeve/cerberus/issues/557 .. _#562: https://github.com/pyeve/cerberus/issues/562

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