Use checkout@v5

Author: kipcole9

.github/workflows/ci.yml

@@ -51,7 +51,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: Set up Elixir
         uses: erlef/setup-beam@v1