[HANDS-ON BUG] LunarLander-v2 is deprecated and needs to be changed to LunarLander-v3

## 🐛 Describe the Bug

The `LunarLander-v2` environment is no longer available as expected. The API has been updated and the environment version has been **incremented to `LunarLander-v3`**, so calling:

```python
env = gym.make("LunarLander-v2")
```

results in an error because `v2` has been deprecated in favor of `v3`. This change was made upstream to fix environment determinism and wind generation behavior.([[gymnasium.farama.org](https://gymnasium.farama.org/gymnasium_release_notes/index.html?utm_source=chatgpt.com)][1])

```python
# v2 deprecated / fails now
env = gym.make("LunarLander-v3")
```

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## 📸 Screenshot

*(Include a screenshot here of the error you’re seeing — e.g., VersionNotFound or similar.)*

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## 📌 Material

* **Did you use Google Colab?**
*Yes *
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### 💡 Notes

* The environment version change was introduced in recent `gymnasium` and related ecosystem updates — the `v2` environments were updated to `v3` to address determinism and randomness issues.
[gymnasium.farama.org](https://gymnasium.farama.org/gymnasium_release_notes/index.html)

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