pyside6-rcc --binary flag ignored

Hello, 

I have been trying to compile .qrc files into .rcc files using pyside6-rcc.exe, but it still compiles as python code, similar to what this user experienced: https://forum.qt.io/topic/132646/could-pyside6-rcc-compile-qrc-to-rcc

Similarly to that user on the forum, if I use rcc.exe directly, the resources do compile properly.

I have tried on a few different versions of PySide from PySide2 5.14.0 to PySide6 6.2.3 and they all exhibit this behavior. 

The command I use is:

pyside2-rcc.exe --binary /path/to/my_qrc.qrc -o /output/my_rcc.rcc

If I do the exact same but as:

rcc.exe --binary /path/to/my_qrc.qrc -o /output/my_rcc.rcc

then everything is fine.

The problem is that rcc.exe is not in our build environments by default, but the pyide6-rcc.exe is, so it would be nice to get it fixed.