/usr/share/vala/vapi/gtksourceview-3.0.deps is in libgtksourceview-3.0-dev 3.14.1-1.
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 7 | atk
gdk-3.0
gdk-pixbuf-2.0
gio-2.0
gtk+-3.0
pango
cairo
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