chore(deps): update dependency attrs to v26

[renovate-bot]

This PR contains the following updates:

Package	Change	Age	Confidence
attrs (changelog)	==25.4.0 → ==26.1.0

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Release Notes

python-attrs/attrs (attrs)

v26.1.0

Compare Source

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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[gemini-code-assist]

Code Review

This pull request updates the dependency version of attrs from 25.4.0 to 26.1.0 in the requirements.txt file for the geography samples of the Google Cloud BigQuery package. There are no review comments, and I have no feedback to provide.

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