build: Update project dependencies and configuration in pyproject.toml.

Author: sergioteula

pyproject.toml

@@ -28,7 +28,6 @@ dependencies = [
     "python_dateutil>=2.8.0",
     "requests>=2.28.0",
     "six>=1.16.0",
-    "typing-extensions>=4.15.0",
     "urllib3>=1.26.0,<3",
 ]
 
@@ -37,7 +36,7 @@ Homepage = "https://github.com/sergioteula/python-amazon-paapi"
 Repository = "https://github.com/sergioteula/python-amazon-paapi"
 
 [project.optional-dependencies]
-async = ["httpx>=0.27.0"]
+async = ["httpx>=0.27.0", "typing-extensions>=4.15.0"]
 
 [build-system]
 requires = ["hatchling"]