Cython latest 3.0 version resulting in pip installation error for PyYAML package

[tiendatphan]

When running the setup script on environment with up-to-date Python, the latest Cython version (3.0.0) causing the following error while installing PyYAML package:

`
Collecting PyYAML<6.0.0 (from tdp-lib@ git+https://github.com/TOSIT-IO/[email protected]>tdp-server==0.1.0)
Using cached PyYAML-5.4.1.tar.gz (175 kB)
Installing build dependencies ... done
Getting requirements to build wheel ... error
error: subprocess-exited-with-error

× Getting requirements to build wheel did not run successfully.
│ exit code: 1
╰─> [62 lines of output]
/tmp/pip-build-env-peey6o5u/overlay/lib/python3.10/site-packages/setuptools/config/setupcfg.py:293: _DeprecatedConfig: Deprecated config in setup.cfg
!!

          ********************************************************************************
          The license_file parameter is deprecated, use license_files instead.
  
          By 2023-Oct-30, you need to update your project and remove deprecated calls
          or your builds will no longer be supported.
  
          See https://setuptools.pypa.io/en/latest/userguide/declarative_config.html for details.
          ********************************************************************************
  
  !!
    parsed = self.parsers.get(option_name, lambda x: x)(value)

`

There are several discussions recently mentioning this error and the solution to fix it:
yaml/pyyaml#736 - The ticket on PyYAML repo
https://discuss.python.org/t/getting-requirements-to-build-wheel-did-not-run-successfully-exit-code-1/30365 - a generic Python discussion forum

The solution proposed is to add a constraints.txt file that limit the version of Cython to be below 3.0.0.

This file will remain useful later for further constraints regarding other packages.