migrate from hub to gh in workflows (#455)

Author: dlqqq

.github/workflows/update-integration-tests.yml

@@ -28,7 +28,7 @@ jobs:
         run: git config --global hub.protocol https
 
       - name: Checkout the branch from the PR that triggered the job
-        run: hub pr checkout ${{ github.event.inputs.number || github.event.issue.number }}
+        run: gh pr checkout ${{ github.event.inputs.number || github.event.issue.number }}
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}