updated pr workflow (#669)

Signed-off-by: Dushyant Behl <dushyantbehl@in.ibm.com>

Author: dushyantbehl

.github/workflows/pr-command.yaml

@@ -46,7 +46,7 @@ jobs:
 
       - uses: actions/checkout@v4
         with:
-          ref: ${{ steps.pr.outputs.ref }}
+          ref: refs/pull/${{ github.event.issue.number }}/head
 
       - name: Free up disk space
         uses: ./.github/actions/free-up-disk-space