Upgrade media / GStreamer / GLib (#30750)

- Upgrade the version of GStreamer for Windows

This upgrades the Windows build to use the most recent version of
GStreamer. This is necessary to upgrade our GStreamer dependency.

- Stop shipping GStreamer binaries on Linux

The binary bundle of GStreamer that we package is not used to compile --
only to run layout tests. It's too old for the APIs that we are using
(as evidenced by needed 1.18 for WebRTC) and nowadays Linux
distributions carry a new version so it's unecessary for our build
machines. No longer using this binary bundle will allow us to upgrade
our GStreamer dependency -- which now has stricter checks that we
are using at least version 1.18.

- Upgrade media to use newer versions of GStreamer / GLib dependencies

Cargo.toml

@@ -40,6 +40,14 @@ fxhash = "0.2"
 getopts = "0.2.11"
 gfx_traits = { path = "components/shared/gfx" }
 gleam = "0.15"
+glib = "0.18"
+gstreamer = { version = "0.21", features = ["v1_18"] }
+gstreamer-base = "0.21"
+gstreamer-gl = "0.21"
+gstreamer-gl-sys = { version = "0.21" }
+gstreamer-gl-wayland = { version = "0.21" }
+gstreamer-sys = "0.21"
+gstreamer-video = "0.21"
 headers = "0.3"
 html5ever = "0.26"
 http = "0.2"