fix(typing): import of Sequence from typing module (issue: #1915)

[noobie-bob]

• Fix for TypeError: 'ABCMeta' object is not subscriptable on Python 3.8, google-auth==2.46.0 #1915
  Updates import of Sequence from typing instead of collections.abc
  google-auth-library-python/google/auth/_default.py

 from collections.abc import Sequence

with

from typing import Sequence

Below are enhancements over PR #1915

• Also moves the typing import under if TYPE_CHECKING check
• Added below import, in start of module file to defer the evaluation of type annotations to "runtime"

from __future__  import annotations 

• ruff format of import organization

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[gemini-code-assist]

Summary of Changes

Hello @noobie-bob, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request addresses an issue by modernizing the handling of type hints within the google/auth/_default.py file. It specifically updates the import of the Sequence type, ensuring it's used correctly for static analysis, and introduces __future__ annotations to prepare for future Python versions. These changes improve the robustness and maintainability of the codebase's type checking.

Highlights

• Type Hinting Modernization: The Sequence type hint import has been updated from collections.abc to typing, and is now conditionally imported within a TYPE_CHECKING block to ensure it's only used for static analysis.
• Future Annotations: The from __future__ import annotations import has been added to enable postponed evaluation of type annotations, improving forward compatibility and simplifying type hint syntax.
• Import Refactoring: Several import statements have been refactored to combine multiple imports from the same module into single lines, enhancing code readability and organization.

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[gemini-code-assist]

Code Review

This pull request correctly addresses the deprecation of collections.abc.Sequence for type hinting by switching to typing.Sequence. The changes also improve the code by adopting modern Python type hinting practices, such as using from __future__ import annotations and moving type-only imports under a TYPE_CHECKING block. The import statements have also been refactored for better style and readability. The changes are correct and improve the overall code quality.

[daniel-sanche]

This was addressed in #1918. Thanks!