chore: update dependency cerberus to v1.3.8

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
Cerberus	1.3.4 -> 1.3.8

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Release Notes

pyeve/cerberus (Cerberus)

v1.3.8

Compare Source

Released on November 6, 2025.

New

- Support for Python 3.14

Version 1.3.7
-------------

Released on December 31, 2024.

Fixed

• Amends missing changelog

v1.3.7

Compare Source

Released on December 31, 2024.

Fixed

- Amends missing changelog

v1.3.6

Compare Source

Released on December 23, 2024.

New

- Support for Python 3.12 & 3.13

Fixed

• Escaping in docstrings (#608_)

.. _#608: #​608

v1.3.5

Compare Source

Released on August 9, 2023.

New

- Support for Python 3.10 & 3.11
- The HTML documentation uses the *furo* theme

Fixed

• *of rules are skipped for None values (#582_)
• Validations of mappings would raise an exception when the field's rules were
  provided as reference to a registry item (#599_)

.. _#582: #​582
.. _#599: #​599

Improved

- Various minor improvements of the documentation

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