Remove copy_with_extension dependency

[PiotrRogulski]

copy_with_extension has been a major annoyance when moving between Flutter versions. leancode_kratos_client used it once to modify one field – I think we can safely do it "manually".

[Copilot]

Pull request overview

This PR removes the copy_with_extension/copy_with_extension_gen dependency pair from leancode_kratos_client by replacing the single generated copyWith(...) usage with a small hand-written helper on AuthFlowDto, and bumps the package version accordingly.

Changes:

• Drop copy_with_extension from dependencies and copy_with_extension_gen from dev dependencies.
• Replace the single copyWith(sessionTokenExchangeCode: ...) call with a manual copyWithSessionTokenExchangeCode(...) method.
• Update generated output (auth_dtos.g.dart), version, and changelog for 0.8.1.

Reviewed changes

Copilot reviewed 4 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
pubspec.yaml	Removes copy_with_extension* deps and bumps package version to 0.8.1.
lib/src/kratos_client.dart	Switches to the new manual DTO helper for updating sessionTokenExchangeCode.
lib/src/common/api/auth_dtos.dart	Removes @CopyWith and introduces copyWithSessionTokenExchangeCode(...).
lib/src/common/api/auth_dtos.g.dart	Removes the previously generated CopyWith section; keeps JsonSerializable output.
CHANGELOG.md	Adds a 0.8.1 entry documenting the dependency removal.

Files not reviewed (1)

• lib/src/common/api/auth_dtos.g.dart: Language not supported

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