Octave is missing a dependency on qt6-5compat

Description:

Without qt6-5compat, octave-gui fails to start:

[~]$ octave    
/usr/lib/octave/9.1.0/exec/x86_64-pc-linux-gnu/octave-gui: error while loading shared libraries: libQt6Core5Compat.so.6: cannot open shared object file: No such file or directory
[~]$ 

Note:

[~]$ ldd /usr/lib/octave/9.1.0/exec/x86_64-pc-linux-gnu/octave-gui | grep -i libqt
...
	libQt6Core5Compat.so.6 => not found
...

Additional info:

• package version(s): octave-9.1.0-5
• config and/or log files: n/a
• link to upstream bug report, if any: n/a

Steps to reproduce:

1. sudo pacman -Rsn qt6-5compat
2. sudo pacman -S octave
3. Attempt to run octave (gui)