Update Actions UnitTest Workflow

[michaeltryby]

This pull request updates the build and test workflows to use newer versions of Python, GitHub Actions, and related build tools, while also refining platform and Python version support. The changes aim to modernize CI/CD processes, improve compatibility, and streamline builds for supported platforms.

CI/CD Workflow Updates

• Upgraded Python versions in the build workflow from 3.7 to 3.10, and restricted matrix builds to only currently supported Python versions (cp39, cp310, cp311, cp312). Dropped support for Python 3.8 and older. [1] [2] [3]
• Updated GitHub Actions and related tools to their latest major versions (actions/checkout@v4, actions/setup-python@v5, actions/upload-artifact@v4, pypa/[email protected]). [1] [2] [3] [4] [5]

Platform and Dependency Adjustments

• Changed build and test matrices to use windows-latest, macos-latest, and ubuntu-latest instead of specific OS versions. [1] [2]
• Added ninja as a build requirement for macOS systems in swmm-toolkit/build-requirements.txt.
• Updated the macOS deployment target in setup.py from 10.9 to 11.0 to match modern macOS standards.

CMake and SWIG Build Configuration

• Set SWIG_COMPILE_DEFINITIONS for output and solver targets to empty (EXPORT_OUT_API= and EXPORT_TOOLKIT=) in CMakeLists to ensure proper symbol exporting on macOS and other platforms. [1] [2]

[michaeltryby]

Close #137