Update class config for pydanticv2

[MatthewMckee4]

Summary by Sourcery

Chores:

• Migrate pydantic.BaseModel config to use ConfigDict.

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Reviewer's Guide by Sourcery

This pull request updates the pydantic configuration for the SimulationSettingsLumericalFdtd class to be compatible with pydantic v2. It replaces the nested Config class with a model_config attribute.

Class diagram showing the updated SimulationSettingsLumericalFdtd configuration

classDiagram
    class SimulationSettingsLumericalFdtd {
        +float background_material_index
        +float port_margin
        +float port_height
        +float port_width
        +float mesh_accuracy
        +float zmargin
        +float ymargin
        +float xmargin
        +float wavelength_start
        +float wavelength_stop
        +float wavelength_points
        +float simulation_time
        +float simulation_temperature
        +float frequency_points_monitor
        +float distance_source_to_monitors
        +float distance_monitors_to_pml
        +dict material_name_to_lumerical
        +ConfigDict model_config
    }
    note for SimulationSettingsLumericalFdtd "Updated to use pydantic v2 ConfigDict
instead of nested Config class"

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File-Level Changes

Change	Details	Files
Updated pydantic configuration to be compatible with pydantic v2.	Removed the nested Config class. Added a model_config attribute with the same configuration.	gdsfactory/generic_tech/simulation_settings.py

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