STY: Try to make mypy happy

src/porepy/grids/md_grid.py

@@ -5,6 +5,7 @@
 
 from __future__ import annotations
 
+from collections.abc import Mapping
 from typing import Any, Callable, Iterable, Literal, Optional, Union, overload
 
 import numpy as np
@@ -697,11 +698,11 @@ def copy(self) -> MixedDimensionalGrid:
 
     def replace_subdomains_and_interfaces(
         self,
-        sd_map: Optional[dict[pp.Grid, pp.Grid]] = None,
+        sd_map: Optional[Mapping[pp.Grid, pp.Grid]] = None,
         intf_map: Optional[
-            dict[
+            Mapping[
                 pp.MortarGrid,
-                Union[pp.MortarGrid, dict[mortar_grid.MortarSides, pp.Grid]],
+                Union[pp.MortarGrid, Mapping[mortar_grid.MortarSides, pp.Grid]],
             ]
         ] = None,
         tol: float = 1e-6,
@@ -976,7 +977,7 @@ def __repr__(self) -> str:
                 for sd in self.subdomains(dim=dim):
                     num_sd += 1
                     nc += sd.num_cells
-                s += f"{num_sd} grids of dimension {dim}" f" with in total {nc} cells\n"
+                s += f"{num_sd} grids of dimension {dim} with in total {nc} cells\n"
         if self.num_interfaces() > 0:
             for dim in range(self.dim_max(), self.dim_min(), -1):
                 num_intf = 0