[Complement tests](https://github.com/matrix-org/complement/pull/790)
Basically, when we use `/state_ids` in conjunction with `/event`
requests, the `/event` request can fail causing a partial state to be
returned. When we persist the state, we process dependent events first.
If we fail to process a dependent event due to missing the `auth_event`,
we didn't update the in-memory event map. This meant that we could
incorrectly persist events that depended on dropped events.
Discovered via Chaos testing.
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Spawning from wanting to confirm my replies in
https://github.com/element-hq/synapse/issues/18489
We're now using the same source of truth of the list of tables being
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Bumps [slab](https://github.com/tokio-rs/slab) from 0.4.10 to 0.4.11.
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