Fix in-place modification of user-input in SAM2 embed boxes
Author: xenova
Pull request: yes

# What does this PR do?

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Repeated application of the model would modify `boxes` in-place, leading to incorrect results after the first execution. This PR ensure a copy of the data is used. For more information as well as a reproduction, refer to [this issue](https://github.com/huggingface/transformers/issues/42172).

Fixes https://github.com/huggingface/transformers/issues/42172


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Comments:
**[For maintainers]** Suggested jobs to run (before merge)

run-slow: edgetam, edgetam_video, sam2, sam2_video

The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/transformers/pr_42173). All of your documentation changes will be reflected on that endpoint. The docs are available until 30 days after the last update.