CVXOPT version 1.3.1

v1.3.1 (#238)

* Switch to setuptools_scm and update workflows

- Addresses issues with CI workflows (versioneer returns 0+unknown on Travis and GH)
- Update GH worksflows, add pyproject.toml
- Use OpenBLAS 0.3.22 on Windows
- Update DSDP patch to facilitate arm64 dylib
- _PYTHON_HOST_PLATFORM on macOS to get correct arch tags
- Fix python target for 3.10+
- Use add_dll_directory() if .libs is present
- Updated INSTALL
- Updated docstrings and copyright