add packaging to requirements.txt

[FFFrog]

As stated in this #107207 (comment), packaging is not a built-in python module and need to add it to requirements.txt.

[pytorch-bot]

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[FFFrog]

@pytorchbot rebase -b main

[pytorchmergebot]

@pytorchbot started a rebase job onto refs/remotes/origin/main. Check the current status here

[pytorchmergebot]

Successfully rebased mrl_fix_packaging onto refs/remotes/origin/main, please pull locally before adding more changes (for example, via git checkout mrl_fix_packaging && git pull --rebase)

[albanD]

Thanks!

[albanD]

@pytorchbot merge

[pytorchmergebot]

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