[`SAM`] fix sam slow test
# What does this PR do?

This PR fixes the slow tests that were failing due to https://github.com/huggingface/transformers/pull/23295

In fact, in the slow test that we have designed, we forgot to use the correct format for the input bounding boxes

Will address a PR on `notebooks` to address the changes in the example notebook

cc @ydshieh @amyeroberts 
Fix for the notebook: https://github.com/huggingface/notebooks/pull/371<|||||>_The documentation is not available anymore as the PR was closed or merged._<|||||>Indeed the tests were passing before because the processor was force unsqueezeing the boxes here: https://github.com/huggingface/transformers/blob/d765717c76026281f2fb27ddc44fa3636306bb48/src/transformers/models/sam/processing_sam.py#L141 

> you can't have floating integers :) 

Hahah yes, thanks for noticing! Copilot does some bad job sometimes ... will update that as well<|||||>Thanks a lot @amyeroberts !<|||||>The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/transformers/pr_23376). All of your documentation changes will be reflected on that endpoint.