fix workflow?

Author: darrenjw

.github/workflows/ci.yml

@@ -13,6 +13,9 @@ jobs:
       with:
         distribution: temurin
         java-version: 8
+    - name: Install cs
+      uses: coursier/cache-action@v6
+      uses: VirtusLab/scala-cli-setup@main
     - name: Install scalafmt
       run: cs setup
     - name: Check formatting