chore(deps): update dependency miniflare to v4

Author: renovate[bot]

package.json

@@ -122,7 +122,7 @@
     "hono": "^3.12.12",
     "knip": "^5.68.0",
     "lint-staged": "^15.5.2",
-    "miniflare": "^3.20250718.2",
+    "miniflare": "^4.0.0",
     "pkg-pr-new": "^0.0.63",
     "pkg-types": "^1.3.1",
     "playwright": "^1.56.1",