py(deps[dev]) Add typing-extensions

See also:
- https://pypi.org/project/typing-extensions/
- https://typing-extensions.readthedocs.io/en/latest/
- https://github.com/python/typing_extensions/
- https://github.com/python/typing_extensions/blob/main/CHANGELOG.md

Author: tony

pyproject.toml

@@ -98,6 +98,7 @@ dev-dependencies = [
   "types-pygments",
   "types-PyYAML",
   "types-requests",
+  "typing-extensions",
 ]
 
 [dependency-groups]
@@ -132,6 +133,7 @@ types = [
   "types-pygments",
   "types-PyYAML",
   "types-requests",
+  "typing-extensions",
 ]
 
 [project.entry-points.pytest11]