Pulls in upstream latest changes from [dendrite-fork
](https://github.com/HereNotThere/dendrite)to subtree at
servers/dendrite here.
Co-authored-by: Tak Wai Wong <64229756+tak-hntlabs@users.noreply.github.com>
Co-authored-by: Tak Wai Wong <tak@hntlabs.com>
Co-authored-by: John Terzis <john@hntlabs.com>
Without this entry, setups where users have the homeserver on the URL
matrix.myurl.com but want the servername to be myurl.com don't work by default
since clients like element.io can't connect to the homeserver