Fix Windows compatibility: upgrade psutil constraint and default TextWrapper to LF newlines

[VimalN2005]

Description

This PR makes two key changes to fix development environment setup and core test failures on Windows machines:

1. Upgrades the psutil constraint in pyproject.toml from <4.0 to >=5.0.0.
2. Sets the default newline parameter in TextWrapper in luigi/format.py to '\n' (LF).

Motivation and Context

1. psutil installation failure: When setting up the development environment on Windows (specifically with Python 3.12+), installing psutil<4.0 forces uv or pip to attempt to build psutil 3.4.2 from source, which fails to compile on modern Python versions without MSVC Build Tools. Upgrading to >=5.0.0 allows the installer to download a pre-compiled wheel.
2. Test failures due to Carriage Returns (\r\n): On Windows, io.TextIOWrapper (underneath TextWrapper) translates line endings to \r\n (CRLF) by default. This causes mock target test assertions that expect \n (LF) to fail (e.g., AssertionError: b'55\r\n' != b'55\n'). Standardizing TextWrapper's default newline to \n ensures cross-platform consistency of output line endings and allows all tests to pass successfully on Windows.

Have you tested this? If so, how?

I have run the unit tests. I verified that both test/fib_test.py and test/decorator_test.py run and pass successfully on a Windows machine after applying these changes.

[VimalN2005]

All checks have passed successfully. Please let me know if any further changes or reviews are needed. Thanks!