Synapse 1.92.0rc1 (2023-09-05)

Add configuration setting for CAS protocol version. Contributed by Aurélien Grimpard. (#15816)
Suppress notifications from message edits per MSC3958. (#16113)
Return a Retry-After with M_LIMIT_EXCEEDED error responses. (#16136)
Add last_seen_ts to the admin users API. (#16218)
Improve resource usage when sending data to a large number of remote hosts that are marked as "down". (#16223)

Fix IPv6-related bugs on SMTP settings, adding groundwork to fix similar issues. Contributed by @evilham and @telmich (ungleich.ch). (#16155)
Fix a spec compliance issue where requests to the /publicRooms federation API would specify include_all_networks as a string. (#16185)
Fix inaccurate error message while attempting to ban or unban a user with the same or higher PL by spliting the conditional statements. Contributed by @leviosacz. (#16205)
Fix a rare bug that broke looping calls, which could lead to e.g. linearly increasing memory usage. Introduced in v1.90.0. (#16210)
Fix a long-standing bug where uploading images would fail if we could not generate thumbnails for them. (#16211)
Fix a long-standing bug where we did not correctly back off from servers that had "gone" if they returned 4xx series error codes. (#16221)

Update links to the matrix.org blog. (#16008)
Document which admin APIs are disabled when experimental MSC3861 support is enabled. (#16168)
Document exclude_rooms_from_sync configuration option. (#16178)

Prepare unit tests for Python 3.12. (#16099)
Fix nightly CI jobs. (#16121, #16213)
Describe which rate limiter was hit in logs. (#16135)
Simplify presence code when using workers. (#16170)
Track per-device information in the presence code. (#16171, #16172)
Stop using the event_txn_id table. (#16175)
Use AsyncMock instead of custom code. (#16179, #16180)
Improve error reporting of invalid data passed to /_matrix/key/v2/query. (#16183)
Task scheduler: add replication notify for new task to launch ASAP. (#16184)
Improve type hints. (#16186, #16188, #16201)
Bump black version to 23.7.0. (#16187)
Log the details of background update failures. (#16212)
Cache device resync requests over replication. (#16241)

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