build(poetry): drop typing-extensions dependency for Python >= 3.8

Author: jakob-keller

commitizen/defaults.py

@@ -1,8 +1,12 @@
 import pathlib
+import sys
 from collections import OrderedDict
 from typing import Any, Dict, Iterable, List, MutableMapping, Optional, Tuple, Union
 
-from typing_extensions import TypedDict
+if sys.version_info < (3, 8):
+    from typing_extensions import TypedDict
+else:
+    from typing import TypedDict
 
 # Type
 Questions = Iterable[MutableMapping[str, Any]]

pyproject.toml

@@ -60,7 +60,7 @@ tomlkit = ">=0.5.3,<1.0.0"
 jinja2 = ">=2.10.3"
 pyyaml = ">=3.08"
 argcomplete = ">=1.12.1,<2.2"
-typing-extensions = "^4.0.1"
+typing-extensions = { version = "^4.0.1", python = "<3.8" }
 charset-normalizer = ">=2.1.0,<3.1"
 
 [tool.poetry.dev-dependencies]