fix: if PastOrToday validator receives a naive datetime, compare to current time without timezone info

This commit updates the `past_or_today_validator` function to handle naive datetimes (those without timezone information) by comparing them to the current time without timezone info. This allows the validator to work correctly with both aware and naive datetimes, ensuring that it can validate past or present datetimes regardless of their timezone awareness.

Author: jacob-a-brown

schemas/__init__.py

@@ -55,7 +55,10 @@ class BaseUpdateModel(BaseCreateModel):
 
 def past_or_today_validator(value: date | datetime) -> date | datetime:
     if isinstance(value, datetime):
-        if value > datetime.now(timezone.utc):
+        if value.tzinfo is None:
+            if value > datetime.now():
+                raise ValueError("Datetime must be in the past or present.")
+        elif value > datetime.now(timezone.utc):
             raise ValueError("Datetime must be in the past or present.")
     elif value > date.today():
         raise ValueError("Date must be today or in the past.")