Fix Pydantic v2 issue, json_dumps has been removed

[botanical]

There is an issue with the STAC API apparent from the CloudWatch logs that we need to update our backend to not use json_dumps since that is no longer supported by Pydantic V2

/tmp/pip-target-jsvcgmwi/lib/python/pydantic/_internal/_config.py:373: UserWarning: Valid config keys have changed in V2: |  
-- | --


* 'json_dumps' has been removed

Relevant logs: https://us-west-2.console.aws.amazon.com/cloudwatch/home?region=us-west-2#logsV2:log-groups/log-group/$252Faws$252Flambda$252Fveda-backend-uah-dev-stacapilambdaCB4D003E-leON6KkcPRnP/log-events/2025$252F04$252F21$252F$255B$2524LATEST$255Dc720e65745de4976b2bd63e0fd1e9b62

Acceptance Criteria

veda-backend/stac_api/runtime/src/render.py

Line 56 in dd864fd

model_config = ConfigDict(json_loads=orjson.loads, json_dumps=orjson_dumps)

The code in render.py is updated to no longer use deprecated parameters

[botanical]

pydantic/pydantic#6388 I'm not sure there is a recommended resolution at the moment