Fix compatibility with black≥26.5

[musicinmybrain]

The black.parsing.SourceASTParseError exception type was split out from black.parsing.ASTSafetyError in black 26.5.0, psf/black#5080.

This fixes:

========================================================================================= FAILURES ==========================================================================================
__________________________________________________________________________ test_pylsp_format_document_syntax_error __________________________________________________________________________

>   ???

src/black/__init__.py:1636:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

>   ???
E   SyntaxError: unexpected indent (<unknown>, line 1)

src/black/parsing.py:162: SyntaxError

During handling of the above exception, another exception occurred:

config = <pylsp.config.config.Config object at 0x7ff7e753de00>, invalid_document = <pylsp.workspace.Document object at 0x7ff7e7545f20>

    def test_pylsp_format_document_syntax_error(config, invalid_document):
>       result = pylsp_format_document(config, invalid_document)
                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

tests/test_plugin.py:179:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
pylsp_black/plugin.py:38: in pylsp_format_document
    return format_document(config, document)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
pylsp_black/plugin.py:73: in format_document
    formatted_text = format_text(text=text, config=config, lines=lines)
                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
pylsp_black/plugin.py:114: in format_text
    formatted_text = black.format_file_contents(
src/black/__init__.py:1124: in format_file_contents
    ???
src/black/__init__.py:1089: in check_stability_and_equivalence
    ???
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

>   ???
E   black.parsing.SourceASTParseError: cannot use --safe with this file; failed to parse source file AST: unexpected indent (<unknown>, line 1)
E   This could be caused by running Black with an older Python version that does not support new syntax used in your source file.

src/black/__init__.py:1638: SourceASTParseError
___________________________________________________________________________ test_pylsp_format_range_syntax_error ____________________________________________________________________________

>   ???

src/black/__init__.py:1636: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

>   ???
E   SyntaxError: unexpected indent (<unknown>, line 1)

src/black/parsing.py:162: SyntaxError

During handling of the above exception, another exception occurred:

config = <pylsp.config.config.Config object at 0x7ff7e75433e0>, invalid_document = <pylsp.workspace.Document object at 0x7ff7e74d19b0>

    def test_pylsp_format_range_syntax_error(config, invalid_document):
        range = {"start": {"line": 0, "character": 0}, "end": {"line": 1, "character": 0}}
    
>       result = pylsp_format_range(config, invalid_document, range=range)
                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

tests/test_plugin.py:253:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
pylsp_black/plugin.py:46: in pylsp_format_range
    return format_document(config, document, range)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
pylsp_black/plugin.py:73: in format_document
    formatted_text = format_text(text=text, config=config, lines=lines)
                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
pylsp_black/plugin.py:114: in format_text
    formatted_text = black.format_file_contents(
src/black/__init__.py:1124: in format_file_contents
    ???
src/black/__init__.py:1089: in check_stability_and_equivalence
    ???
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

>   ???
E   black.parsing.SourceASTParseError: cannot use --safe with this file; failed to parse source file AST: unexpected indent (<unknown>, line 1)
E   This could be caused by running Black with an older Python version that does not support new syntax used in your source file.

src/black/__init__.py:1638: SourceASTParseError
===================================================================================== warnings summary ======================================================================================
tests/test_plugin.py:8
  /home/ben/src/forks/python-lsp-black/tests/test_plugin.py:8: UserWarning: pkg_resources is deprecated as an API. See https://setuptools.pypa.io/en/latest/pkg_resources.html. The pkg_resources package is slated for removal as early as 2025-11-30. Refrain from using this package or pin to Setuptools<81.
    import pkg_resources

-- Docs: https://docs.pytest.org/en/stable/how-to/capture-warnings.html
================================================================================== short test summary info ==================================================================================
FAILED tests/test_plugin.py::test_pylsp_format_document_syntax_error - black.parsing.SourceASTParseError: cannot use --safe with this file; failed to parse source file AST: unexpected indent (<unknown>, line 1)
FAILED tests/test_plugin.py::test_pylsp_format_range_syntax_error - black.parsing.SourceASTParseError: cannot use --safe with this file; failed to parse source file AST: unexpected indent (<unknown>, line 1)
========================================================================== 2 failed, 19 passed, 1 warning in 0.38s ==========================================================================