fixup! Hash checking of cached wheels

Author: sbidoul

src/pip/_internal/exceptions.py

@@ -16,10 +16,12 @@
 from pip._vendor.rich.text import Text
 
 if TYPE_CHECKING:
-    from typing import Literal
+    from typing import Literal, Protocol
 
     from pip._internal.metadata import BaseDistribution
     from pip._internal.req.req_install import InstallRequirement
+else:
+    Protocol = object
 
 
 #