chore(deps): update devdependency undici to v7

Author: renovate[bot]

package.json

@@ -110,7 +110,7 @@
     "typescript": "^5.7.2",
     "uWebSockets.js": "github:uNetworking/uWebSockets.js#v20.44.0",
     "unbuild": "^2.0.0",
-    "undici": "^6.21.0",
+    "undici": "^7.2.1",
     "vitest": "^2.1.8",
     "wrangler": "^3.99.0",
     "ws": "^8.18.0"