fix(firestore): remove usage of typing_extensions

[shokkunrf]

Fixes #17244 🦕

This PR addresses the google-cloud-firestore portion of #17244 ("Remove usage of typing_extensions in google-cloud-python") by replacing the only typing_extensions import in this package with the stdlib typing equivalents.

Summary

google/cloud/firestore_v1/async_transaction.py was the sole module in google-cloud-firestore importing from typing_extensions. All three names it imports (Concatenate, ParamSpec, TypeVar) are available in the stdlib typing module since Python 3.10, and setup.py declares python_requires=">=3.10", so the import can be moved to the stdlib without any compatibility loss.

Changes

packages/google-cloud-firestore/google/cloud/firestore_v1/async_transaction.py:

• Add Concatenate, ParamSpec, TypeVar to the existing from typing import (...) block (kept alphabetical).
• Remove the from typing_extensions import Concatenate, ParamSpec, TypeVar line.

Why this works

Symbol	Stdlib typing availability
Concatenate	Python 3.10+
ParamSpec	Python 3.10+
TypeVar	Always available

Verification

In a clean venv with only google-cloud-firestore installed (no typing-extensions), from google.cloud.firestore_v1 import async_transaction now succeeds — confirming the dependency on typing-extensions is fully removed.

Scope note

Other packages in this monorepo also use typing_extensions (google-api-core, google-cloud-bigtable, google-cloud-spanner, bigframes). Each has its own python_requires and set of imported symbols (notably Self, which requires Python 3.11+ in the stdlib), so this PR is scoped to google-cloud-firestore only. Let me know if you'd like me to follow up with PRs for any of the others — happy to.

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[gemini-code-assist]

Code Review

This pull request refactors the imports in async_transaction.py by moving Concatenate, ParamSpec, and TypeVar from typing_extensions to the standard typing library. There are no review comments, and I have no additional feedback to provide.

[parthea]

Hi @shokkunrf, Thanks for opening a PR! Please could you sign the CLA? #17357 (comment)

[shokkunrf]

@googlebot I signed it!

[parthea]

Thanks for the fix, @shokkunrf!

[shokkunrf]

@googlebot I signed it!

[hebaalazzeh]

Looks good to me. Nice cleanup!

[shokkunrf]

Thanks for the quick review and merge!