Update actions/checkout from v4 to v6 (#1069)

Co-authored-by: Linda Cannon <lindalu@microsoft.com>

Author: ElizabethSamuel-MSFT

.github/workflows/auto-publish.yml

@@ -14,7 +14,7 @@ jobs:
         working-directory: ./
     steps:
       - name: Check out repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
         with:
           fetch-depth: 0
       - name: Check out main
@@ -35,3 +35,4 @@ jobs:
         run: |
           echo "Pushing changes to live branch"
           git push origin live
+