Update nibabel/fileholders.py

Co-authored-by: Zvi Baratz <[email protected]>

Author: effigies

nibabel/fileholders.py

@@ -10,7 +10,6 @@
 from __future__ import annotations
 
 import io
-import typing as ty
 from copy import copy
 
 from .openers import ImageOpener
@@ -100,7 +99,7 @@ def file_like(self) -> str | io.IOBase | None:
         return self.fileobj if self.fileobj is not None else self.filename
 
 
-FileMap = ty.Mapping[str, FileHolder]
+FileMap = dict[str, FileHolder]
 
 
 def copy_file_map(file_map: FileMap) -> FileMap: