use workspace dependancies

packages/signals/Cargo.toml

@@ -6,5 +6,5 @@ edition = "2018"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-dioxus-core = { path = "../core" }
-slab = "0.4.7"
+dioxus-core = { workspace = true }
+slab = { workspace = true }