chore(deps): replace toml by tomli for py<3.11 as a fallback for "tomllib"

[mdevolde]

chore(deps): replace toml by tomli for py<3.11 as a fallback for "tomllib"

Why the pull request was made

To avoid having a dependency for toml on py<3.11 when tomllib exists. And replace toml fallback by a maintained lib tomli.

Summary of changes

• Replace toml dependency by tomli (only for py<3.11).
• Rename _deprecated.py as _compat.py.
• Add the tomllib/tomli import in _compat.py, to expose a common interface in the lib.

Screenshots (if appropriate):

Not applicable.

How has this been tested?

Applied local tests.

Resources

Not applicable.

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(deps) update

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 TOML parsing dependency strategy by using the stdlib tomllib on Python ≥3.11 and falling back to tomli on older Python versions, while also consolidating version-dependent imports into a new internal compatibility module.

Changes:

• Replaced the runtime dependency on toml with tomli only for Python <3.11 (using tomllib otherwise).
• Renamed/internalized compatibility helpers by replacing _deprecated.py with _compat.py (now also exposing toml_loads).
• Updated internal imports and call sites to use _compat.deprecated and _compat.toml_loads.

Reviewed changes

Copilot reviewed 8 out of 9 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
uv.lock	Swaps toml for tomli with a Python <3.11 marker and removes the toml package entry.
pyproject.toml	Updates project dependencies to use tomli only on Python <3.11.
language_tool_python/_compat.py	New centralized compat module exposing deprecated and toml_loads with version-based fallbacks.
language_tool_python/_deprecated.py	Removes the old dedicated deprecated helper module in favor of _compat.py.
language_tool_python/download_lt.py	Switches TOML parsing from toml.loads to _compat.toml_loads.
language_tool_python/__main__.py	Switches TOML parsing from toml.loads to _compat.toml_loads for version/config reads.
language_tool_python/utils.py	Updates deprecated import to come from _compat.
language_tool_python/match.py	Updates deprecated import to come from _compat.
tests/test_deprecated.py	Updates test import to reference _compat.deprecated.

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