marge_bot: add gst-sharp to the list of projects

Was forgotten it seems or accidently deleted during a rebase
or something.

Part-of: <!2>

infrastructure/marge_bot/create_margebot.py

@@ -24,6 +24,7 @@ MODULES = [
     "gstreamer-project",
     "gstreamer-rs",
     "gstreamer-rs-sys",
+    "gstreamer-sharp",
     "gstreamer-vaapi",
     "gst-rtsp-server",
     "gst-template",