/usr/lib/gnome-settings-daemon-3.0/gtk-modules/caribou-gtk3-module.desktop is in libcaribou-gtk3-module 0.4.21-1+b1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 | [GTK Module]
Name=Caribou
Description=Caribou On-Screen Keyboard GTK+ Module
X-GTK-Module-Name=caribou-gtk-module
X-GTK-Module-Enabled-Schema=org.gnome.desktop.a11y.applications
X-GTK-Module-Enabled-Key=screen-keyboard-enabled
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