feat: bump mypy-extensions and fix deprecations

[s3bc40]

• Bump mypy-extensions to >=1.1.0
• Fix deprecations in mamushi/parsing/comparator.py and parser.py.

- return Token(type_=tokens.NEWLINE, value="")
+ return Token(type=tokens.NEWLINE, value="")

tests/test_format.py: 86 warnings
  /home/s3bc40/gh-projects/mamushi/src/mamushi/parsing/parser.py:61: DeprecationWarning: 'count' is passed as positional argument
    return re.sub(r"[ \t]+\n", "\n", code, re.MULTILINE) + "\n"

-- Docs: https://docs.pytest.org/en/stable/how-to/capture-warnings.html

• Update poetry.lock and Pipfile to reflect the changes.
• Update pyproject.toml to ensure compatibility with the new mypy-extensions version.

Pytest: OK ✔️