fix(memory): prevent unbounded growth of navigations array in PageCollector

Author: flobo3

src/PageCollector.ts

@@ -409,5 +409,6 @@ export class NetworkCollector extends PageCollector<HTTPRequest> {
     } else {
       navigations.unshift([]);
     }
+    navigations.splice(3); // Hardcoded to match #maxNavigationSaved since it's private in base class
   }
 }