Update language submodules

[revin]

Hello, it looks like the submodules in /deps haven't been updated in a year or so, and in npm/marky-markdown#125 we have an issue that could be fixed by updating the JavaScript dependency. I'll attach a PR for that one, but (and this is just a hunch) I was thinking it might be a good idea to audit them all to see if we'd benefit by updating them. Or maybe live dangerously and just git submodule update --remote the whole lot of them 😛

[revin]

(forgot to /cc @ashleygwilliams)

FYI, I did the full update in my local fork, and while all the tests pass, I'm guessing that doesn't tell us much. I haven't looked at the individual submodules' repos to know if they're in a good state as of the latest commits.