Accept access_token instead of id_access_token on the IS, accept Authorization header (#697)
Accept access_token instead of id_access_token on the IS, accept Authorization header (#697)

Synapse PR: https://github.com/matrix-org/synapse/pull/6013 which has context

We now accept `access_token` instead of `id_access_token` and do so using the `Authorization` header instead of in the JSON body, as [MSC2140](https://github.com/matrix-org/matrix-doc/pull/2140/files#diff-c03a26de5ac40fb532de19cb7fc2aaf7R80) states.
matrix-org/sytest,matrix-org/sytest