Update dependency attrs to v26

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
attrs (changelog)	<26 → <27

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Release Notes

python-attrs/attrs (attrs)

v26.1.0

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Backwards-incompatible Changes

• Field aliases are now resolved before calling field_transformer, so transformers receive fully populated Attribute objects with usable alias values instead of None.
  The new Attribute.alias_is_default flag indicates whether the alias was auto-generated (True) or explicitly set by the user (False).
  #​1509

Changes

• Fix type annotations for attrs.validators.optional(), so it no longer rejects tuples with more than one validator.
  #​1496
• The attrs.validators.disabled() contextmanager can now be nested.
  #​1513
• Frozen classes can set on_setattr=attrs.setters.NO_OP in addition to None.
  #​1515
• It's now possible to pass attrs instances in addition to attrs classes to attrs.fields().
  #​1529

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