CLI: Improved error control and updated hub requirement
# What does this PR do?

This PR adds three things to the `pt-to-tf` CLI:
- Updates the hub minimum version requirement, so that all users can adequately use this CLI (the new `0.9.0` is a requirement to open a PR with a non-god token)
- Adds more flexible admissible error control (some models were failing with errors like 6e-5, which was annoying. The `5e-5` is a magic number anyways)
- Improves the commit message, in case the user fiddles with the admissible error
_The documentation is not available anymore as the PR was closed or merged._