Always remove authority section when cleaning URL

Author: barneygale

src/pip/_internal/models/link.py

@@ -133,8 +133,8 @@ def _clean_file_url_path(part: str) -> str:
     # exist, the colon should be quoted. We rely on urllib.request
     # to do the right thing here.
     ret = urllib.request.pathname2url(urllib.request.url2pathname(part))
-    if sys.version_info >= (3, 14):
-        # https://discuss.python.org/t/pathname2url-changes-in-python-3-14-breaking-pip-tests/97091
+    if ret.startswith("///"):
+        # Remove authority section from URL.
         ret = ret.removeprefix("//")
     return ret