As we use `execute_values` with the `fetch` parameter.

Introduced in #9104 

This wasn't picked up by the tests as this is all fine the first time you run Synapse (after upgrading), but then when you restart the wrong value is pulled from `stream_positions`. 

... to avoid clashes with other SSO mechanisms

If a remote server name is provided, ensure it is something reasonable
before making remote connections to it.

Replace 'perspectives' config block with 'trusted_key_servers' in docker homeserver.yaml template (#9157)

Make sure we report the correct config path for errors in the OIDC configs.

...instead of just creating the exception object and doing nothing with it.

* Factor out a common TestHtmlParser

Looks like I'm doing this in a few different places.

* Improve OIDC login test

Complete the OIDC login flow, rather than giving up halfway through.

* Ensure that OIDC login works with multiple OIDC providers

* Fix bugs in handling clientRedirectUrl

 - don't drop duplicate query-params, or params with no value
 - allow utf-8 in query-params

setuptools 51.0.0 dropped support for Python 3.5.

0dd2649c (#9112) changed the signature of `auth_via_oidc`. Meanwhile,
26d10331 (#9091) introduced a new test which relied on the old signature of
`auth_via_oidc`. The two branches were never tested together until they landed
in develop.