update checkout action version

Signed-off-by: Karl W. Schulz <karl.schulz@amd.com>

.github/workflows/docs-2.x.yml

@@ -28,7 +28,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
       - name: Additional python packages
         run: pip3 install -r requirements-doc.txt
       - name: Setup Pages