chat/matrix-synapse: Update to 1.71.0

Synapse 1.71.0 (2022-11-08)
===========================

Please note that, as announced in the release notes for Synapse
1.69.0, legacy Prometheus metric names are now disabled by default.
They will be removed altogether in Synapse 1.73.0.  If not already
done, server administrators should update their dashboards and
alerting rules to avoid using the deprecated metric names.  See the
[upgrade
notes](https://matrix-org.github.io/synapse/v1.71/upgrade.html#upgrading-to-v1710)
for more details.

**Note:** in line with our [deprecation
  policy](https://matrix-org.github.io/synapse/latest/deprecation_policy.html)
  for platform dependencies, this will be the last release to support
  PostgreSQL 10, which reaches upstream end-of-life on November 10th,
  2022. Future releases of Synapse will require PostgreSQL 11+.

Features
--------

- Support back-channel logouts from OpenID Connect
  providers. ([\#11414](https://github.com/matrix-org/synapse/issues/11414))

- Allow use of Postgres and SQLlite full-text search operators in
  search
  queries. ([\#11635](https://github.com/matrix-org/synapse/issues/11635),
  [\#14310](https://github.com/matrix-org/synapse/issues/14310),
  [\#14311](https://github.com/matrix-org/synapse/issues/14311))

- Implement
  [MSC3664](https://github.com/matrix-org/matrix-doc/pull/3664),
  Pushrules for relations. Contributed by
  Nico. ([\#11804](https://github.com/matrix-org/synapse/issues/11804))

- Improve aesthetics of HTML templates. Note that these changes do not
  retroactively apply to templates which have been
  [customised](https://matrix-org.github.io/synapse/latest/templates.html#templates)
  by server
  admins. ([\#13652](https://github.com/matrix-org/synapse/issues/13652))

- Enable write-ahead logging for SQLite installations. Contributed by
  [@asymmetric](https://github.com/asymmetric). ([\#13897](https://github.com/matrix-org/synapse/issues/13897))

- Show erasure status when [listing
  users](https://matrix-org.github.io/synapse/latest/admin_api/user_admin_api.html#query-user-account)
  in the Admin
  API. ([\#14205](https://github.com/matrix-org/synapse/issues/14205))

- Provide a specific error code when a `/sync` request provides a
  filter which doesn't represent a JSON
  object. ([\#14262](https://github.com/matrix-org/synapse/issues/14262))

(gdt)