/usr/share/vala/vapi/gcr-ui-3.deps is in libgcr-3-dev 3.20.0-5.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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glib-2.0 gio-2.0 gck-1 gcr-3 gtk+-3.0