"pyside6-project lupdate" is unable to generate .ts files to subfolders

Using the `pyside6-project lupdate` command can generate the ts files used for translations in PySide6. However, sometimes we want to place the ts files in a subfolder, but we find that it is impossible to achieve this.

This is because the `pyside6-project lupdate` command uses the ts file names, which do not include paths. Therefore, it operates within the project directory, and since there are several ts files, it will execute multiple times.