♻️ Refactor test to not depend on a util for it

Author: tiangolo

tests/test_fields_set.py

@@ -1,7 +1,6 @@
 from datetime import datetime, timedelta
 
 from sqlmodel import Field, SQLModel
-from sqlmodel._compat import get_fields_set
 
 
 def test_fields_set():
@@ -11,12 +10,12 @@ class User(SQLModel):
         last_updated: datetime = Field(default_factory=datetime.now)
 
     user = User(username="bob")
-    assert get_fields_set(user) == {"username"}
+    assert user.model_fields_set == {"username"}
     user = User(username="bob", email="bob@test.com")
-    assert get_fields_set(user) == {"username", "email"}
+    assert user.model_fields_set == {"username", "email"}
     user = User(
         username="bob",
         email="bob@test.com",
         last_updated=datetime.now() - timedelta(days=1),
     )
-    assert get_fields_set(user) == {"username", "email", "last_updated"}
+    assert user.model_fields_set == {"username", "email", "last_updated"}