chore(deps): add typing_extensions for py<3.13 to have a fallback for "deprecated"

[mdevolde]

chore(deps): add typing_extensions for py<3.13 to have a fallback for "deprecated"

Why the pull request was made

Because our trick to replace warnings.deprecated in py<3.13 was triggering some mypy errors, and simply using typing_extensions.deprecated is a better solution.

Summary of changes

• Add typing_extensions as a dependency for py<3.13.
• In language_tool_python._deprecated.py, import warnings.deprecated for py>= 3.13, import typing_extensions.deprecated else.
• Remove unused "type: ignore" comments when using deprecated decorator in the lib.

Screenshots (if appropriate):

Not appropriate.

How has this been tested?

Applied local tests.

Resources

Not appropriate.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update (changes to documentation only)
• Refactor / code style update (non-breaking change that improves code structure or readability)
• Tests / CI improvement (adding or updating tests or CI configuration only)
• Other (please describe): chore update (new dependency)

Checklist

• Followed the project's contributing guidelines.
• Updated any relevant tests.
• Updated any relevant documentation.
• Added comments to your code where necessary.
• Formatted your code, run the linters, checked types and tests.

[Copilot]

Pull request overview

This PR updates the project’s deprecation decorator implementation to use warnings.deprecated on Python ≥ 3.13 and typing_extensions.deprecated on earlier Python versions, resolving mypy issues and allowing removal of several type: ignore suppressions.

Changes:

• Add typing_extensions as a conditional dependency for Python < 3.13.
• Simplify language_tool_python._deprecated to select deprecated from warnings (≥3.13) or typing_extensions (<3.13).
• Remove now-unnecessary mypy suppression comments around @deprecated usage in library code and tests.

Reviewed changes

Copilot reviewed 6 out of 7 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
pyproject.toml	Adds conditional runtime dependency on typing_extensions for Python < 3.13.
uv.lock	Locks the new conditional dependency in the uv lockfile metadata.
language_tool_python/_deprecated.py	Switches to version-based import between warnings.deprecated and typing_extensions.deprecated.
language_tool_python/utils.py	Removes type: ignore comments from @deprecated usage now that the decorator is typed.
language_tool_python/match.py	Removes type: ignore comments from @deprecated usage.
language_tool_python/download_lt.py	Removes type: ignore comments from @deprecated usage.
tests/test_deprecated.py	Removes type: ignore comments in tests now that the decorator is typed.

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