Update GitHub Actions to use latest versions

Author: pablorcum

.github/workflows/main.yml

@@ -27,10 +27,10 @@ jobs:
     steps:  
       # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
       - name: Check out repo
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Cache MATLAB build files
-        uses: actions/cache@v4
+        uses: actions/cache@v5
         with:
           key: matlab-buildtool
           path: |