fix: resolve CI/CD test failures and linting issues

config_convert/utils/flatten.py

@@ -1,8 +1,6 @@
 """Utilities for flattening and unflattening nested dictionaries."""
 
-import re
-from collections.abc import MutableMapping
-from typing import Any, Dict, List, Tuple
+from typing import Any, Dict, List
 
 
 def flatten_dict(data: Dict[str, Any], parent_key: str = "", sep: str = ".") -> Dict[str, Any]:
@@ -104,7 +102,6 @@ def _split_key(key: str, sep: str) -> List[str]:
 def _set_nested(d: Any, parts: List[str], value: Any) -> None:
     """Set a value in a nested structure, creating intermediate dicts or lists as needed."""
     current = d
-    path = []  # Track the path to enable modification at the right level
 
     for i, part in enumerate(parts[:-1]):
         if isinstance(current, list):
@@ -137,7 +134,7 @@ def _set_nested(d: Any, parts: List[str], value: Any) -> None:
                     current[part] = {}
                     current = current[part]
         else:
-            raise ValueError(f"Cannot traverse through non-dict/list object")
+            raise ValueError("Cannot traverse through non-dict/list object")
 
     last_part = parts[-1]
     if isinstance(current, list):