Update dependency cattrs to v26

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
cattrs (changelog)	==25.2.0 → ==26.1.0

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Release Notes

python-attrs/cattrs (cattrs)

v26.1.0

Compare Source

• Add the {mod}tomllib <cattrs.preconf.tomllib> preconf converter.
  See here for details.
  (#​716)
• Customizing un/structuring of attrs classes, dataclasses, TypedDicts and dict NamedTuples is now possible by using Annotated[T, override()] on fields.
  See here for more details.
  (#​717)
• Fix structuring of nested generic classes with stringified annotations.
  (#​688)
• Python 3.9 is no longer supported, as it is end-of-life. Use previous versions on this Python version.
  (#​698)
• Apply the attrs converter to the default value before checking if it is equal to the attribute's value, when omit_if_default is true and an attrs converter is specified.
  (#​696)
• Use the optional _value_ type hint to structure and unstructure enums if present.
  (#​699)
• Aliases (when in use) now properly generate rename metadata in generated hooks.
  (#​706 #​710)
• cattrs now tracks performance using codspeed.
  (#​703)
• The {mod}tomlkit <cattrs.preconf.tomlkit> preconf converter now properly handles native date objects when structuring.
  (#​707 #​708)
• The {mod}tomlkit <cattrs.preconf.tomlkit> preconf converter now passes date objects directly to tomlkit for unstructuring.
  (#​707 #​708)
• Enum handling has been optimized by switching to hook factories, improving performance especially for plain enums.
  (#​705)
• Fix {func}cattrs.strategies.include_subclasses when used with {func}cattrs.strategies.configure_tagged_union and classes using diamond inheritance.
  (#​685 #​713)
• Fix {func}cattrs.strategies.configure_tagged_union when used with recursive type aliases.
  (#​678 #​714)

v25.3.0

Compare Source

• Potentially breaking: Abstract sets are now structured into frozensets.
  This allows hashability, better immutability and is more consistent with the collections.abc.Set type.
  See Migrations for steps to restore legacy behavior.
  (#​686)
• Python 3.14 is now supported and part of the test matrix.
  (#​653)
• Fix unstructuring NewTypes with the {class}BaseConverter.
  (#​684)
• Make some Hypothesis tests more robust.
  (#​684)
• {func}cattrs.strategies.include_subclasses now works with generic parent classes and the tagged union strategy.
  (#​683)

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