fix: update Node.js and pnpm versions to match repository requirements

Co-Authored-By: Nathan Clevenger <nateclev@gmail.com>

Author: devin-ai-integration[bot]

.github/workflows/cloudflare-deploy.yml

@@ -20,12 +20,12 @@ jobs:
       - name: Setup pnpm
         uses: pnpm/action-setup@v2
         with:
-          version: 8
+          version: 9
 
       - name: Setup Node.js
         uses: actions/setup-node@v4
         with:
-          node-version: '18'
+          node-version: '20'
           cache: 'pnpm'
 
       - name: Install dependencies