Updated workflow with latest checkout and cache actions

Author: jgaa

.github/workflows/ci.yaml

@@ -25,12 +25,12 @@ jobs:
 
     steps:
       - name: Checkout code
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
         with:
           submodules: true
 
       - name: Cache
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: |
             ~/vcpkg