fix bmo parser for new format / lints

actual_imap_poll/model.py

@@ -1,5 +1,5 @@
+import datetime
 from dataclasses import dataclass
-from datetime import date
 from decimal import Decimal
 from uuid import UUID
 
@@ -12,7 +12,7 @@ class Transaction:
     """
 
     account: UUID
-    date: date
+    date: datetime.date
     amount: Decimal  # Note: decimal dollars, JS shim will convert to cents as described in the API
     payee: str  # imported_payee in API
     notes: str