Fix use-after-free in debug utils names setup

[HadrienG2]

This fixes the use-after-free but that I discovered while playing around with debug utils names (first reported in #2242).

1. Update documentation to reflect any user-facing changes - in this repository. => No docs change

2. Make sure that the changes are covered by unit-tests. => UB cannot be covered by unit tests I think?

3. Run cargo fmt on the changes.

4. Please put changelog entries in the description of this Pull Request
   if knowledge of this change could be valuable to users. No need to put the
   entries to the changelog directly, they will be transferred to the changelog
   file by maintainers right after the Pull Request merge.

   Please remove any items from the template below that are not applicable.

5. Describe in common words what is the purpose of this change, related
   Github Issues, and highlight important implementation aspects. => See above.

Changelog:

### Bugs fixed
- `Device::set_debug_utils_object_name` no longer exhibits use-after-free UB.

[Rua]

Thanks for spotting and fixing it!