Merge tag 'v1.96.1' into tedomum

Synapse will soon be forked by Element under an AGPLv3.0 licence (with CLA, for
proprietary dual licensing). You can read more about this here:

* https://matrix.org/blog/2023/11/06/future-of-synapse-dendrite/
* https://element.io/blog/element-to-adopt-agplv3/

The Matrix.org Foundation copy of the project will be archived. Any changes needed
by server administrators will be communicated via our usual
[announcements channels](https://matrix.to/#/#homeowners:matrix.org), but we are
striving to make this as seamless as possible.

This minor release was needed only because of CI-related trouble on [v1.96.0](https://github.com/matrix-org/synapse/releases/tag/v1.96.0), which was never released.

- Fix building of wheels in CI. ([\#16653](https://github.com/matrix-org/synapse/issues/16653))