chore(deps): update dependency miniflare@3>undici to v6 [security]

Author: renovate[bot]

package.json

@@ -117,7 +117,7 @@
       "cookie@<0.7.0": "0.7.2",
       "tar-fs": "2.1.2",
       "ip": "npm:[email protected]",
-      "miniflare@3>undici": "5.28.5"
+      "miniflare@3>undici": "6.21.2"
     },
     "patchedDependencies": {
       "[email protected]": "patches/[email protected]",