chore(ci): consolidate Node version reference in CI to associated .nvmrc (#32192)

Signed-off-by: hainenber <dotronghai96@gmail.com>

.github/workflows/tech-debt.yml

@@ -32,7 +32,7 @@ jobs:
       - name: Set up Node.js
         uses: actions/setup-node@v4
         with:
-          node-version: '20'
+          node-version-file: './superset-frontend/.nvmrc'
 
       - name: Install Dependencies
         run: npm install