📝 Update links to Pydantic docs to point to new website (#11328)

tests/test_tutorial/test_custom_response/test_tutorial006c.py

@@ -8,7 +8,7 @@ client = TestClient(app)
 def test_redirect_status_code():
     response = client.get("/pydantic", follow_redirects=False)
     assert response.status_code == 302
-    assert response.headers["location"] == "https://pydantic-docs.helpmanual.io/"
+    assert response.headers["location"] == "https://docs.pydantic.dev/"
 
 
 def test_openapi_schema():