[Bug 773976] The submodule needs to be updated

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=773976

--- Comment #5 from Mathieu Duponchelle <mduponchelle1 at gmail.com> ---
Hm and hotdoc needs to be updated to latest pip:

```
pip install --update hotdoc hotdoc-c-extension
```

I'll simplify all this a bit more at some point it's annoying.

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