Using below command to set short cut key Alt+Shift for switching Keyboard Languages (For my Ubuntu 24.04.3 LTS)

$ gsettings set org.gnome.desktop.wm.keybindings switch-input-source "['Shift_L', 'Alt_L']"

$ gsettings set org.gnome.desktop.wm.keybindings switch-input-source-backward "[]"