lose typing-extensions dependency

Author: M-Chan

template/pyproject.toml.jinja

@@ -14,9 +14,7 @@ classifiers = [
     "Programming Language :: Python :: 3.11",
 ]
 description = "{{ description }}"
-dependencies = [
-    "typing-extensions;python_version<'3.8'",
-] # Add project dependencies here, e.g. ["click", "numpy"]
+dependencies = [] # Add project dependencies here, e.g. ["click", "numpy"]
 dynamic = ["version"]
 license.file = "LICENSE"
 readme = "README.rst"