vet workspace dependencies (#163)

- Update the used workspace dependencies.
- Remove the unused workspace dependencies.
- Add the machete CI workflow.

.github/workflows/rust.yml

@@ -36,6 +36,9 @@ jobs:
           sudo apt update
           sudo apt install -y ethereum
 
+      - name: Machete
+        uses: bnjbvr/cargo-machete@main
+
       - name: Format
         run: make format