Bumps the version of typing_extensions to include Self Type

setup.py

@@ -80,8 +80,7 @@
         "protobuf>=4.21.6",
         "pywin32>=223;platform_system=='Windows'",
         "requests>=2.16.0",
-        # remove typing_extensions after python_requires>=3.8, see web3._utils.compat
-        "typing-extensions>=3.7.4.1,<5;python_version<'3.8'",
+        "typing-extensions>=4.0.1,<5",
         "websockets>=10.0.0",
     ],
     python_requires=">=3.7.2",

web3/_utils/compat/__init__.py

@@ -1,16 +1,8 @@
-import sys
+# Changelog for `typing_extensions` for checking which types were added when
+# https://github.com/python/typing_extensions/blob/main/CHANGELOG.md
 
-# remove once web3 supports python>=3.8
-# Types was added to typing in 3.8
-if sys.version_info >= (3, 8):
-    from typing import (
-        Literal,
-        Protocol,
-        TypedDict,
-    )
-else:
-    from typing_extensions import (  # noqa: F401
-        Literal,
-        Protocol,
-        TypedDict,
-    )
+# Note that we do not need to explicitly check for python version here,
+# because `typing_extensions` will do it for us and either import from `typing`
+# or use the back-ported version of the type.
+
+from typing_extensions import Literal, Protocol, TypedDict, Self