[BugFix] Categorical spec samples the right dtype when masked

[louisfaury]

Description

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Motivation and Context

When masked, the Categorical specs always sampled long ints.

Types of changes

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• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds core functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation (update in the documentation)
• Example (update in the folder of examples)

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• I have updated the documentation accordingly.

[pytorch-bot]

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[louisfaury]

I am seeing many broken tests from test_specs.py, but I doubt that is coming from this PR ?

[vmoens]

LGTM

[vmoens]

I am seeing many broken tests from test_specs.py, but I doubt that is coming from this PR ?

have you tried updating tensordict?

[louisfaury]

Right, must be it!