Update haystack experimental dep (#421)

Author: sjrl

index.toml

@@ -249,7 +249,7 @@ notebook = "47_Human_in_the_Loop_Agent.ipynb"
 aliases = []
 completion_time = "20 min"
 created_at = 2025-10-30
-dependencies = ["haystack-experimental>=0.14.2"]
+dependencies = ["haystack-experimental>=0.16.0"]
 featured = true
 
 [[tutorial]]
@@ -261,5 +261,5 @@ notebook = "48_Conversational_RAG.ipynb"
 aliases = []
 completion_time = "20 min"
 created_at = 2025-12-30
-dependencies = ["haystack-experimental>=0.15.0", "datasets"]
+dependencies = ["haystack-experimental>=0.16.0", "datasets"]
 featured = true