Signed-off-by: Silke Hofstra <silke@slxh.eu>

fix federation_domain_whitelist

we were checking the wrong server_name on inbound requests

Update canonicaljson dependency

This reverts commit 9fbe70a7.

It turns out that sortedcontainers.SortedDict is not an exact match for
blist.sorteddict; in particular, `popitem()` removes things from the opposite
end of the dict.

This is trivial to fix, but I want to add some unit tests, and potentially some
more thought about it, before we do so.

1.1.2 was a bit broken too :/

1.1.0 and 1.1.1 were broken, so we're updating this to help people make sure
they don't end up on a broken version.

Also, 1.1.0 is speedier...

Add metrics for ResponseCache

Add metrics for event processing lag

Document the behaviour of ResponseCache

Send events to ASes concurrently

Synapse on PyPy

Merge commit '11d2609d' of https://github.com/matrix-org/synapse into release-v0.27.0

fix typo

Limit concurrent event sends for a room

Send federation events concurrently