fix: use relative import for enums in models.py

Consistent with all other files in the package that use relative imports.

Author: S1M0N38

src/balatrobench/models.py

@@ -57,7 +57,7 @@
 from dataclasses import dataclass
 from typing import Literal
 
-from balatrobench.enums import Deck, Stake
+from .enums import Deck, Stake
 
 ################################################################################
 # Version, Manifest, Strategy, Model & Config