Update R-CMD-check.yml

# Updated actions/checkout to v4 for compatibility with Node.js 20

Author: NightlordTW

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

@@ -29,7 +29,7 @@ jobs:
       R_KEEP_PKG_SOURCE: yes
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - uses: r-lib/actions/setup-pandoc@v2