Update R-CMD-check.yaml

Author: bczernecki

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

@@ -41,7 +41,7 @@ jobs:
       GITHUB_PAT: ${{ secrets.GITHUB_TOKEN }}
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
 
       - uses: r-lib/actions/setup-r@v2
         with: