fix: reactive_graph doctests depend on leptos itself

reactive_graph/Cargo.toml

@@ -28,6 +28,7 @@ send_wrapper = { version = "0.6.0", features = ["futures"] }
 web-sys = "0.3"
 
 [dev-dependencies]
+leptos = { workspace = true }
 tokio = { version = "1", features = ["rt-multi-thread", "macros"] }
 tokio-test = { version = "0.4" }
 any_spawner = { workspace = true, features = ["futures-executor", "tokio"] }