chore: minor cleanup (#228)

Signed-off-by: Drew Cain <groksrc@gmail.com>

src/basic_memory/models/project.py

@@ -1,6 +1,6 @@
 """Project model for Basic Memory."""
 
-from datetime import datetime
+from datetime import datetime, UTC
 from typing import Optional
 
 from sqlalchemy import (
@@ -52,9 +52,9 @@ class Project(Base):
     is_default: Mapped[Optional[bool]] = mapped_column(Boolean, default=None, nullable=True)
 
     # Timestamps
-    created_at: Mapped[datetime] = mapped_column(DateTime, default=datetime.utcnow)
+    created_at: Mapped[datetime] = mapped_column(DateTime, default=lambda: datetime.now(UTC))
     updated_at: Mapped[datetime] = mapped_column(
-        DateTime, default=datetime.utcnow, onupdate=datetime.utcnow
+        DateTime, default=lambda: datetime.now(UTC), onupdate=lambda: datetime.now(UTC)
     )
 
     # Define relationships to entities, observations, and relations