[Setup] Parametrize PyTorch version with env variable for local builds

[dvmazur]

Description

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Sometimes it's needed to install tensordict with a PyTorch version than are poorly parsed by python's dependency resolver. For instance, Nvidia's NVCR containers come with PyTorch versions that don't follow semver guidelines (are missing a dash after patch). This leads to pip install a version of PyTorch from PyPI. It wold be helpful to be able to specify the needed version inside an environment variable.

Motivation and Context

close #1244

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[dvmazur]

Hi, @vmoens! Could you help me out with the Benchmark CI. I don't quite understand why it is failing.

[vmoens]

Hi, @vmoens! Could you help me out with the Benchmark CI. I don't quite understand why it is failing.

Not because of this PR!