No significant changes since 1.127.0rc1.

- Update [MSC4140](https://github.com/matrix-org/matrix-spec-proposals/pull/4140) implementation to no longer cancel a user's own delayed state events with an event type & state key that match a more recent state event sent by that user. ([\#17810](https://github.com/element-hq/synapse/issues/17810))

- Fixed a minor typo in the Synapse documentation. Contributed by @karuto12. ([\#18224](https://github.com/element-hq/synapse/issues/18224))

- Remove undocumented `SYNAPSE_USE_FROZEN_DICTS` environment variable. ([\#18123](https://github.com/element-hq/synapse/issues/18123))
- Fix detection of workflow failures in the release script. ([\#18211](https://github.com/element-hq/synapse/issues/18211))
- Add caching support to media endpoints. ([\#18235](https://github.com/element-hq/synapse/issues/18235))

* Bump anyhow from 1.0.96 to 1.0.97. ([\#18201](https://github.com/element-hq/synapse/issues/18201))
* Bump bcrypt from 4.2.1 to 4.3.0. ([\#18207](https://github.com/element-hq/synapse/issues/18207))
* Bump bytes from 1.10.0 to 1.10.1. ([\#18227](https://github.com/element-hq/synapse/issues/18227))
* Bump http from 1.2.0 to 1.3.1. ([\#18245](https://github.com/element-hq/synapse/issues/18245))
* Bump sentry-sdk from 2.19.2 to 2.22.0. ([\#18205](https://github.com/element-hq/synapse/issues/18205))
* Bump serde from 1.0.218 to 1.0.219. ([\#18228](https://github.com/element-hq/synapse/issues/18228))
* Bump serde_json from 1.0.139 to 1.0.140. ([\#18202](https://github.com/element-hq/synapse/issues/18202))
* Bump ulid from 1.2.0 to 1.2.1. ([\#18246](https://github.com/element-hq/synapse/issues/18246))
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