Infer Node.js version from downstream package.json

.github/workflows/make_pr_for_downstream_repo.yaml

@@ -45,17 +45,17 @@ jobs:
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
 
-      - uses: actions/setup-node@v4
-        with:
-          node-version: '16'
-
       - name: Checkout downstream repo
         uses: actions/checkout@v4
         with:
           repository: ${{ inputs.repository }}
           path: ${{ env.DESTINATION_REPO_DIR }}
           token: ${{ secrets.GH_TOKEN_NEXTSTRAIN_BOT_REPO }}
 
+      - uses: actions/setup-node@v4
+        with:
+          node-version-file: ${{ env.DESTINATION_REPO_DIR }}/${{ inputs.directory }}/package.json
+
       - name: Install Auspice from PRs HEAD commit
         shell: bash
         working-directory: ${{ env.DESTINATION_REPO_DIR }}/${{ inputs.directory }}