fix formatting script

Author: schillic

.github/workflows/format.yml

@@ -10,6 +10,8 @@ jobs:
     steps:
       - name: Check out repository
         uses: actions/checkout@v6
+      - name: Set up Julia
+        uses: julia-actions/setup-julia@v2
       - name: Cache artifacts
         uses: julia-actions/cache@v2
       - name: Install JuliaFormatter and format