It looks like libgdal29 was never in any Debian release, so this package
was probably created for Ubuntu.
The Python-dependency (or more: conflict) also a problematic one here.
Sid has moved on but the 3rd-party package mysql-workbench has not been
updated and probably will not be updated until a released Debian version
ships with python-3.10+.
So with the missing libgdal29 and the python version being no longer
available, you will not be able to install the package in Debian.
See if there is an AppImage, Flatpak or Snap available or create a
Ubuntu chroot and install it in there. Using a VM is also possible.
Grüße,
S°
--
Sigmentation fault. Core dumped.