MNT: Require typing_extensions for Python <3.13

Author: effigies

pyproject.toml

@@ -14,6 +14,7 @@ dependencies = [
   "numpy >=1.20",
   "packaging >=17",
   "importlib_resources >=5.12; python_version < '3.12'",
+  "typing_extensions >=4.6; python_version < '3.13'",
 ]
 classifiers = [
   "Development Status :: 5 - Production/Stable",

tox.ini

@@ -77,7 +77,8 @@ extras = test
 deps =
   # General minimum dependencies: pin based on API usage
   min: packaging ==17
-  min: importlib_resources ==1.3; python_version < '3.9'
+  min: importlib_resources ==5.12; python_version < '3.12'
+  min: typing_extensions ==4.6; python_version < '3.13'
   # NEP29/SPEC0 + 1yr: Test on minor release series within the last 3 years
   # We're extending this to all optional dependencies
   # This only affects the range that we test on; numpy is the only non-optional