Update mario_rl_tutorial.py

[ahoblitz]

This should fix #2627

Fixes #2627

Description

Click on Run in Google Collab button and Run all cells

It will fail while trying to import tensordict:

---------------------------------------------------------------------------
ModuleNotFoundError                       Traceback (most recent call last)
[<ipython-input-3-8f359b2f0b63>](https://localhost:8080/#) in <cell line: 21>()
     19 import gym_super_mario_bros
     20 
---> 21 from tensordict import TensorDict
     22 from torchrl.data import TensorDictReplayBuffer, LazyMemmapStorage

ModuleNotFoundError: No module named 'tensordict'

Checklist

• The issue that is being fixed is referred in the description (see above "Fixes #ISSUE_NUMBER")
• Only one issue is addressed in this pull request
• Labels from the issue that this PR is fixing are added to this pull request
• No unnecessary issues are included into this pull request.

cc @vmoens @nairbv @sekyondaMeta @svekars @carljparker @NicolasHug @kit1980 @subramen

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/tutorials/2640

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[vmoens]

LGTM thanks!