Update dataclasses.replace calls in DefaultRetryStrategy

This pull request addresses issue #111 by updating the `dataclasses.replace` calls to `call_args.model_copy(update={...})` in the `DefaultRetryStrategy` class. This change is necessary because `SpiceCallArgs` has been converted from a dataclass to a Pydantic model. The updates ensure that the retry strategy correctly modifies the `temperature` attribute of `call_args` based on the attempt number.

spice/retry_strategy/default_strategy.py

@@ -17,9 +17,9 @@ def decide(
         self, call_args: SpiceCallArgs, attempt_number: int, model_output: str, name: str
     ) -> tuple[Behavior, SpiceCallArgs, Any, str]:
         if attempt_number == 1 and call_args.temperature is not None:
-            call_args = dataclasses.replace(call_args, temperature=max(0.2, call_args.temperature))
+            call_args = call_args.model_copy(update={"temperature": max(0.2, call_args.temperature)})
         elif attempt_number > 1 and call_args.temperature is not None:
-            call_args = dataclasses.replace(call_args, temperature=max(0.5, call_args.temperature))
+            call_args = call_args.model_copy(update={"temperature": max(0.5, call_args.temperature)})
 
         if self.validator and not self.validator(model_output):
             if attempt_number < self.retries: