python-attrs: bump to 26.1.0

python-attrs: bump to 26.1.0

Changelog since 25.3.0:
- v25.4.0: Add python-hatch-fancy-pypi-readme as build dependency
- v26.1.0: Field aliases now resolved before calling field_transformer,
  with new Attribute.alias_is_default flag (#1509); fix type annotations
  for validators.optional() with tuples (#1496); validators.disabled()
  now supports nesting (#1513); frozen classes support
  on_setattr=attrs.setters.NO_OP (#1515); attrs.fields() accepts
  instances in addition to classes (#1529)

Full changelog: https://www.attrs.org/en/stable/changelog.html

Signed-off-by: Alexandru Ardelean <redacted>