fix ci

Author: lucywang000

w3lib/util.py

@@ -6,6 +6,12 @@
 def str_to_unicode(
     text: StrOrBytes, encoding: Optional[str] = None, errors: str = "strict"
 ) -> str:
+    warn(
+        "The w3lib.utils.str_to_unicode function is deprecated and "
+        "will be removed in a future release.",
+        DeprecationWarning,
+        stacklevel=2,
+    )
     if encoding is None:
         encoding = "utf-8"
     if isinstance(text, bytes):