chore(workflow): use nvmrc file

.github/workflows/snjs.upgrade.event.yml

@@ -17,6 +17,7 @@ jobs:
       - uses: actions/setup-node@v3
         with:
           registry-url: 'https://registry.npmjs.org'
+          node-version-file: '.nvmrc'
       - name: Setup git config
         run: |
           git config --global user.name "standardci"