chore: remove unused dev-dependency

Author: mariinkys

Cargo.lock

@@ -19,9 +19,6 @@ leptos_router = { version = "0.8.2", features = ["nightly"] }
 wasm-bindgen = "=0.2.100"
 memmap2 = { version = "0.9.5", optional = true }
 
-[dev-dependencies]
-tokio = { version = "1.45.1", features = ["macros", "rt"] }
-
 [features]
 csr = ["leptos/csr"]
 hydrate = ["leptos/hydrate"]