Update action version

Author: bbimber

.github/workflows/R-CMD-check.yaml

@@ -27,7 +27,7 @@ jobs:
       GITHUB_PAT: ${{ secrets.GITHUB_TOKEN }}
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v7
 
       - name: Free Disk Space (Ubuntu)
         uses: jlumbroso/free-disk-space@main