chore(deps): update dependency zod to v4

Author: renovate[bot]

baseline-mcp-server.ts

@@ -1,7 +1,7 @@
 // baseline-mcp-server.ts
 import { McpServer } from "npm:@modelcontextprotocol/sdk@^1.11.1/server/mcp.js";
 import { StdioServerTransport } from "npm:@modelcontextprotocol/sdk@^1.11.1/server/stdio.js";
-import { z } from "npm:zod@^3.24.4";
+import { z } from "npm:zod@^4.0.0";
 import {
   getNegatedBrowserBaselineStatusAsMCPContent,
   getWebFeatureBaselineStatusAsMCPContent,

deno.json

@@ -14,7 +14,7 @@
   },
   "imports": {
     "@modelcontextprotocol/sdk": "npm:@modelcontextprotocol/sdk@^1.15.1",
-    "zod": "npm:zod@^3.24.4"
+    "zod": "npm:zod@^4.0.0"
   },
   "publish": {
     "include": [