Update main.yml

.github/workflows/main.yml

@@ -8,7 +8,7 @@ jobs:
     steps:
       - name: Check out repository code
         # https://github.com/actions/checkout/tree/v3.0.2
-      - uses: actions/checkout@v4
+        uses: actions/checkout@v4
         with:
           ref: ics
       - name: Create UFC.ics