Update dependency torchrl to v0.7.1

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
torchrl	==0.7.0 -> ==0.7.1

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Release Notes

pytorch/rl (torchrl)

v0.7.1: 0.7.1: Bug fixes and documentation improvements

Compare Source

We are pleased to announce the release of torchrl v0.7.1, which includes several bug fixes, documentation updates, and backend improvements.

Bug Fixes

• Fixed collector timeouts (#​2774)
• Fixed composite setitem (#​2778)
• Ensured that Composite.set returns self as TensorDict does (#​2784)
• Fixed PPOs with composite distribution (#​2791)
• Used brackets to get non-tensor data in gym envs (#​2769)
• Avoided calling reset during env init (#​2770)
• NonTensor should not convert anything to numpy (#​2771)

Documentation Updates:

• Fixed tutorials (#​2768)
• Solved ref issues in docstrings (#​2776)
• Fixed formatting errors (#​2786)

Backend Improvements:

• Made better logits in cost tests (#​2775)
• Ensured abstractmethods are implemented for specs (#​2790)
• Removed deprec specs from tests (#​2767)

Thank you to @​antoinebrl, and @​louisfaury for contributing to this release!

Full Changelog: pytorch/rl@v0.7.0...v0.7.1

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