/usr/share/vala/vapi/gwibber-0.2.deps is in libgwibber-dev 3.4.0-0ubuntu4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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gobject-2.0 glib-2.0 dee-1.0 gee-1.0 json-glib-1.0 gio-2.0