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

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

.github/workflows/superset-docs-verify.yml

@@ -60,10 +60,10 @@ jobs:
         with:
           persist-credentials: false
           submodules: recursive
-      - name: Set up Node.js 20
+      - name: Set up Node.js
         uses: actions/setup-node@v4
         with:
-          node-version: '20'
+          node-version-file: './docs/.nvmrc'
       - name: yarn install
         run: |
           yarn install --check-cache