Fixed pydantic bugs in agent.py and calibration.py

[jswade-rtx]

Bug fix for error raised when trying to run calibrations for GWO or PSO caused by deprecated Pydantic syntax (https://jira.nextgenwaterprediction.com/browse/NGWPC-7570).

Additions

Removals

Changes

• Pydantic V2 bug fixes to agent.py and calibration.py to enable GWO and PSO calibration runs

Testing

Screenshots

Notes

Todos

Checklist

• PR has an informative and human-readable title
• Changes are limited to a single goal (no scope creep)
• Code can be automatically merged (no conflicts)
• Code follows project standards (link if applicable)
• Passes all existing automated tests
• Any change in functionality is tested
• New functions are documented (with a description, list of inputs, and expected output)
• Placeholder code is flagged / future todos are captured in comments
• Project documentation has been updated (including the "Unreleased" section of the CHANGELOG)
• Reviewers requested with the Reviewers tool ➡️

Testing checklist

Target Environment support

• Linux
• MacOS

[cmaynard-ngwpc]

Successfully tested running this update in AWS workspace for both PWO and GWO.