Version 0.9.9 (#2732)v0.9.9

Changelog and version bump.

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 # Changelog
 
+## Dendrite 0.9.9 (2022-09-22)
+
+### Features
+
+* Dendrite will now try to keep HTTP connections open to remote federated servers for a few minutes after a request and attempt to reuse those connections where possible
+  * This should reduce the amount of time spent on TLS handshakes and often speed up requests to remote servers
+  * This new behaviour can be disabled with the `federation_api.disable_http_keepalives` option if needed
+* A number of dependencies have been updated
+
+### Fixes
+
+* A bug where the roomserver did not correctly propagate rewritten room state to downstream components (like the federation API and sync API) has been fixed, which could cause issues when performing a federated join to a previously left room
+* Event auth now correctly parses the `join_authorised_via_users_server` field in the membership event content
+* Database migrations should no longer produce unique constraint errors at Dendrite startup
+* The `origin` of device list updates should now be populated correctly
+* Send-to-device messages will no longer be dropped if we fail to publish them to specific devices
+* The roomserver query to find state after events will now always resolve state if there are multiple prev events
+* The roomserver will now return no memberships if querying history visibility for an event which has no state snapshot
+* The device list updater will now mark a device list as stale if a requesting device ID is not known
+* Transactions sent to appservices should no longer have accidental duplicated transaction IDs (contributed by [tak-hntlabs](https://github.com/tak-hntlabs))
+
 ## Dendrite 0.9.8 (2022-09-12)
 
 ### Important