examples: Remove unused reqwest-eventsource dependency (#3668)

Author: tottoto

examples/Cargo.lock

@@ -18,4 +18,3 @@ tracing-subscriber = { version = "0.3", features = ["env-filter"] }
 [dev-dependencies]
 eventsource-stream = "0.2"
 reqwest = { version = "0.12", default-features = false, features = ["stream"] }
-reqwest-eventsource = "0.6"