build: update dependency undici to v7.6.0

Author: angular-robot

package.json

@@ -140,7 +140,7 @@
     "ts-node": "^10.9.1",
     "tslib": "2.8.1",
     "typescript": "5.8.2",
-    "undici": "7.5.0",
+    "undici": "7.6.0",
     "unenv": "^1.10.0",
     "verdaccio": "6.1.0",
     "verdaccio-auth-memory": "^10.0.0",

packages/angular_devkit/build_angular/package.json

@@ -70,7 +70,7 @@
     "@web/test-runner": "0.20.0",
     "browser-sync": "3.0.3",
     "ng-packagr": "20.0.0-next.2",
-    "undici": "7.5.0"
+    "undici": "7.6.0"
   },
   "peerDependencies": {
     "@angular/compiler-cli": "0.0.0-ANGULAR-FW-PEER-DEP",