Upgrade wrangler to v4 in deploy workflow

The v3 wrangler was causing deployment failures with
"Failed to publish your Function" internal errors.

Author: neuromechanist

.github/workflows/deploy.yml

@@ -27,6 +27,7 @@ jobs:
         with:
           apiToken: ${{ secrets.CLOUDFLARE_API_TOKEN }}
           accountId: ${{ secrets.CLOUDFLARE_ACCOUNT_ID }}
+          wranglerVersion: "4"
           command: pages deploy _site --project-name=eegmanysteps --branch=${{ github.head_ref || 'main' }}
 
       - name: Update deployment comment on PR