`pyside6-project lupdate` forgets subfolders

Trying to use the `pyside6-project lupdate` command to update translation files does not work correctly if the `.pyproject` file used includes files in subfolders (e.g. `src/main.py`). When internally constructing the `lupdate` command to run, any folder paths are removed (leaving, in the example above, just the `main.py`). The command then promptly fails, as the file in question does not exist.

This issue is caused by the following line in the source code of `pyside6-project`: https://code.qt.io/cgit/pyside/pyside-setup.git/tree/sources/pyside-tools/project.py#n246

Calling p.name there means only the filename of the path is included. The line should ideally be adapted to read

cmd_prefix = [LUPDATE_CMD] + source_files 

or perhaps

cmd_prefix = [LUPDATE_CMD] + [os.path.normpath(p) for p in source_files]