ci: update deb package checkout action to v6

Signed-off-by: Drew Newberry <anewberry@nvidia.com>

Author: drew

.github/workflows/deb-package.yml

@@ -42,7 +42,7 @@ jobs:
         username: ${{ github.actor }}
         password: ${{ secrets.GITHUB_TOKEN }}
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           ref: ${{ inputs['checkout-ref'] }}