Merge branch 'release-v1.57' into develop

changelog.d/12317.misc

-Update docstrings to explain how to decipher live and historic pagination tokens.

changelog.d/12321.misc

-Add ground work for speeding up device list updates for users in large numbers of rooms.

changelog.d/12326.misc

-Fix typechecker problems exposed by signedjson 1.1.2.

changelog.d/12327.feature

-Add a module callback to react to account data changes.

changelog.d/12329.bugfix

-Fix non-member state events not resolving for historical events when used in [MSC2716](https://github.com/matrix-org/matrix-spec-proposals/pull/2716) `/batch_send` `state_events_at_start`.

changelog.d/12330.misc

-Avoid trying to calculate the state at outlier events.

changelog.d/12331.doc

-Update dead links in `check-newsfragment.sh` to point to the correct documentation URL.

changelog.d/12332.misc

-Avoid trying to calculate the state at outlier events.

changelog.d/12333.bugfix

-Fix a long-standing bug affecting URL previews that would generate a 500 response instead of a 403 if the previewed URL includes a port that isn't allowed by the relevant blacklist.

changelog.d/12334.misc

-Remove the `tox` packaging job: it will be redundant once #11537 lands.

changelog.d/12335.misc

-Ignore `.envrc` for `direnv` users.

changelog.d/12336.misc

-Remove the (broadly unused, dev-only) dockerfile for pg tests.

changelog.d/12338.bugfix

-Fix a long-standing bug where events from ignored users were still considered for bundled aggregations.

changelog.d/12339.doc

-Upgrade the version of `mdbook` in CI to 0.4.17.

changelog.d/12341.feature

-Allow setting user admin status using the module API. Contributed by Famedly.

changelog.d/12345.doc

-Updates to the Room DAG concepts development document to clarify that we mark events as outliers because we don't have any state for them.

changelog.d/12346.misc

-Remove redundant `get_success` calls in test code.

changelog.d/12347.misc

-Add type annotations for `tests/unittest.py`.

changelog.d/12348.misc

-Move single-use methods out of `TestCase`.

changelog.d/12349.misc

-Remove broken and unused development scripts.