changelog.d/15415.misc

-Bump immutabledict from 2.2.3 to 2.2.4.

changelog.d/15421.misc

-Only load the SSO redirect servlet if SSO is enabled.
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changelog.d/15423.bugfix

-Improve robustness when handling a perspective key response by deduplicating received server keys.
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changelog.d/15425.bugfix

-Synapse now correctly fails to start if the config option `app_service_config_files` is not a list.
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changelog.d/15427.misc

-Refactor `SimpleHttpClient` to pull out a base class.

changelog.d/15428.bugfix

-Disable loading `RefreshTokenServlet` (`/_matrix/client/(r0|v3|unstable)/refresh`) on workers.
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changelog.d/15429.misc

-Improve DB performance of clearing out old data from `stream_ordering_to_exterm`.

changelog.d/15431.feature

-Add some validation to `instance_map` configuration loading.

changelog.d/15432.misc

-Improve type hints.

changelog.d/15433.misc

-Convert async to normal tests in `TestSSOHandler`.
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changelog.d/15435.misc

-Speed up the user directory background update.

changelog.d/15436.feature

-Allow loading `/capabilities` endpoint on workers.
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changelog.d/15438.misc

-Disable directory listing for static resources in `/_matrix/static/`.
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changelog.d/15441.misc

-Bump dawidd6/action-download-artifact from 2.26.1 to 2.27.0.

changelog.d/15442.misc

-Bump serde_json from 1.0.95 to 1.0.96.

changelog.d/15443.misc

-Bump serde from 1.0.159 to 1.0.160.

changelog.d/15444.misc

-Bump pillow from 9.4.0 to 9.5.0.

changelog.d/15445.misc

-Bump furo from 2023.3.23 to 2023.3.27.

changelog.d/15446.misc

-Bump types-pyopenssl from 23.1.0.0 to 23.1.0.2.

changelog.d/15447.misc

-Bump mypy from 1.0.0 to 1.0.1.