Use actions/checkout@v5

Author: kipcole9

.github/workflows/ci.yml

@@ -50,7 +50,7 @@ jobs:
 
     # Step: Check out the code.
     - name: Checkout code
-      uses: actions/checkout@v3
+      uses: actions/checkout@v5
 
     # Step: Define how to cache deps. Restores existing cache if present.
     - name: Cache deps