Address PR review

Author: hukkinj1

markdown_it/renderer.py

@@ -6,7 +6,6 @@ class Renderer
 rules if you create plugin and adds new token types.
 """
 import inspect
-import sys
 from typing import (
     ClassVar,
     MutableMapping,
@@ -18,10 +17,10 @@ class Renderer
 from .token import Token
 from .utils import OptionsDict
 
-if sys.version_info < (3, 8):
-    from typing_extensions import Protocol
-else:
+try:
     from typing import Protocol
+except ImportError:  # Python <3.8 doesn't have `Protocol` in the stdlib
+    from typing_extensions import Protocol  # type: ignore[misc]
 
 
 class RendererProtocol(Protocol):