/usr/share/vala-0.40/vapi/gstreamer-rtsp-server-1.0.deps is in valac-0.40-vapi 0.40.4-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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gstreamer-rtsp-1.0 gstreamer-net-1.0 gio-2.0