BLD: Remove typing-extensions as a dependency

pyproject.toml

@@ -59,7 +59,6 @@ dependencies = [
     "shapely>=1.6.2",
     "tables<3.9;platform_system != 'Darwin' and python_version == '3.8'", # TODO: mac...
     "tables;platform_system != 'Darwin' and python_version > '3.8'",      # TODO: mac...
-    "typing-extensions",
 ]
 
 [project.urls]

src/xtgeo/grid3d/_find_gridprop_in_eclrun.py

@@ -4,11 +4,10 @@
 import pathlib
 import warnings
 from pathlib import Path
-from typing import Dict, List, Optional, Union
+from typing import Dict, List, Literal, Optional, Union
 
 import numpy as np
 import resfo
-from typing_extensions import Literal
 
 import xtgeo
 

src/xtgeo/grid3d/_gridprop_import_eclrun.py

@@ -1,7 +1,6 @@
-from typing import List, Union
+from typing import List, Literal, Union
 
 import resfo
-from typing_extensions import Literal
 
 from ._find_gridprop_in_eclrun import (
     find_gridprop_from_init_file,

src/xtgeo/grid3d/_gridprops_import_eclrun.py

@@ -1,7 +1,5 @@
 from copy import deepcopy
-from typing import List, Tuple, Union
-
-from typing_extensions import Literal
+from typing import List, Literal, Tuple, Union
 
 import xtgeo
 from xtgeo.common.constants import MAXKEYWORDS