Update werkzeug

Author: svix-mman

python/requirements-dev.txt

@@ -74,7 +74,7 @@ urllib3==2.5.0
     # via
     #   requests
     #   types-requests
-werkzeug==3.0.6
+werkzeug==3.1.4
     # via pytest-httpserver
 wheel==0.44.0
     # via pip-tools

python/tests/test_client.py

@@ -204,6 +204,7 @@ def webhook_handler(request: Request) -> Response:
         assert "Svix-Signature" in request.headers
 
         webhook = Webhook(secret)
+        headers: dict[str, str] = dict(request.headers.items())
         received_payload = webhook.verify(request.data, request.headers)
         assert received_payload == payload