Add support for Python 3.14 #251

What is the need for this task.
Python 3.14 was released in October 2025 (https://devguide.python.org/versions/), meshkernelpy should now be tested for Python 3.10 to 3.14, or at least for these two versions and maybe also 3.12 just to be safe. The building process claims to be python-3-proof, so only the testing part has to be done on multiple Python versions. It seems from the macos workflow and the teamcity workflow we only test on Python 3.10 which might not cover all usecases. For instance, the dependencies numpy and matplotlib will release new versions that are not available to Python 3.10 anymore, so any breaking/api changes there will go unnoticed.

What is the task?
Add tests for multiple Python versions, including 3.10 and 3.14.

Additional information
When updating versions, also consider the minimal required Python version for meshkernel, since Python 3.8 and 3.9 are officially not supported anymore and can therefore also not be tested anymore on github.