chore: Update auto-update job (#1473)

Author: lukaszsocha2

.github/workflows/autoupdate-pr.yml

@@ -24,10 +24,13 @@ jobs:
 
       - name: Auto update pull requests
         run: |
-          PR_LIST=$(curl -s -H "Authorization: Bearer ${{ secrets.DISPATCH_ACCESS_TOKEN }}" "https://api.github.com/repos/$GITHUB_REPOSITORY/pulls?state=open" | jq -r '.[] | .head.ref')
+          PR_LIST=$(curl -s -H "Authorization: Bearer ${{ secrets.DISPATCH_ACCESS_TOKEN }}" \
+            "https://api.github.com/repos/$GITHUB_REPOSITORY/pulls?state=open&base=${{ github.ref_name }}" \
+            | jq -r '.[] | select(.user.login=="box-sdk-build") | .head.ref')
+
           for pr_branch in $PR_LIST; do
             git checkout "$pr_branch"
-            if git merge origin/combined-sdk; then
+            if git merge origin/${{ github.ref_name }}; then
               git push
             else
               # Conflict occurred, resolve by keeping our changes