fix copy dependencies

packages/copy/Cargo.toml

@@ -8,3 +8,6 @@ edition = "2018"
 
 [dependencies]
 bumpalo = { version = "3.6" }
+
+[dev-dependencies]
+rand = "0.8.5"

packages/signals/Cargo.toml

@@ -8,4 +8,4 @@ edition = "2018"
 
 [dependencies]
 dioxus-core = { workspace = true }
-dioxus-copy = { workspace = true }
+dioxus-copy = { workspace = true }