Update zenoh and yaks dependencies in BUILD.md

[gabrielepmattia]

See issue #170

[gabrik]

Thanks @gabrielepmattia for your contribution.
However, in order to accept this, you need to sign your comment.
You can do this by running git commit --amend -s
And you need to sing the Eclipse Contribution Agreement, see https://github.com/eclipse-fog05/fog05/blob/master/CONTRIBUTING.md#eclipse-contributor-agreement

Once you have done that we can review the PR and accept the contribution.
You can also update the CONTRIBUTORS.rst file with your name if you wish.

[gabrielepmattia]

Perfect, I think I'm done

[gabrik]

Thanks for your contribution!
I'll merge that once we got the approval for the dependencies from Eclipse (https://dev.eclipse.org/ipzilla/show_bug.cgi?id=21517)