Remove error when time overshoots maximum time

[RemDelaporteMathurin]

This pull request includes changes to improve error handling and add a new test case. The most important changes include modifying the get_row method in src/hisp/scenario.py to use a warning instead of raising an error, and adding a new test case in test/test_mb_model_festim.py to check for model overshoot at the last timestep.

Error handling improvements:

• src/hisp/scenario.py: Changed the get_row method to issue a UserWarning instead of raising a ValueError when the time t is out of bounds. This allows the method to return a value even when the time is out of bounds.

Testing enhancements:

• test/test_mb_model_festim.py: Added a new test case test_model_last_timestep_overshoot to verify the behavior of the model when the last timestep overshoots. This test case initializes a scenario and model, sets the model parameters, and checks the iteration process.

[kaelyndunnell]

Looks good!