🚨🚨🚨 Vivit update default rescale_factor value

[amyeroberts]

What does this PR do?

Updates the default value for rescale_factor in line with the updates that happened in #25174 and in the model's checkpoints on the hub 1, 2

Before submitting

• This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
• Did you read the contributor guideline,
  Pull Request section?
• Was this discussed/approved via a Github issue or the forum? Please add a link
  to it if that's the case.
• Did you make sure to update the documentation with your changes? Here are the
  documentation guidelines, and
  here are tips on formatting docstrings.
• Did you write any new necessary tests?

[ydshieh]

thanks!

[HuggingFaceDocBuilderDev]

The documentation is not available anymore as the PR was closed or merged.

[ArthurZucker]

Thanks for the prompt fix !