Proposal: Add modern `Promise.allSettled` alternative to "Fetch users" task solution

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## Description

The current [solution](https://github.com/javascript-tutorial/en.javascript.info/blob/20208769e528337949e946f526534d61d38bac47/5-network/01-fetch/01-fetch-users/solution.md) for the ["Fetch users from GitHub"](https://github.com/javascript-tutorial/en.javascript.info/blob/20208769e528337949e946f526534d61d38bac47/5-network/01-fetch/01-fetch-users/task.md) task demonstrates parallel execution by mixing `.then()` with `async/await`. While this serves its stated pedagogical purpose, modern JavaScript codebases typically utilize pure `async/await` combined with `Promise.allSettled` for concurrent, fault-tolerant network requests.

## Proposal

I propose adding a brief "Alternative modern approach" section to the bottom of the `solution.md` file. This addition will demonstrate how to achieve the same concurrent execution and error handling using `Promise.allSettled` and asynchronous array mapping, without removing the original lesson.

Lee 5-network/01-fetch/01-fetch-users/solution.md junto con el task.md enlazado y la solution existente. Añade una breve sección «Enfoque moderno alternativo» que demuestre solicitudes concurrentes y tolerantes a fallos con Promise.allSettled, async/await y mapeo asíncrono de arrays, manteniendo la lección original. La tarea estará terminada cuando el ejemplo sea claro, coherente con la tarea y esté documentado en el archivo solution.

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