Update hasql-notifications to include the fix on
https://github.com/diogob/hasql-notifications/issues/24.
Which now reveals the following error:
```
$ postgrest-with-postgresql-16 --replica -f test/spec/fixtures/load.sql postgrest-run
17/May/2024:18:35:38 -0500: Successfully connected to PostgreSQL 16.2 on x86_64-pc-linux-gnu, compiled by gcc (GCC) 13.2.0, 64-bit
17/May/2024:18:35:38 -0500: Could not listen for notifications on the "pgrst" channel. ERROR: cannot execute LISTEN during recovery
17/May/2024:18:35:38 -0500: Retrying listening for notifications...
```
This is still not good because the LISTEN channel will be retried
forever without a backoff.
The fatal logic is now inside `usePool`. It centralizes the
logic which is better for Locality of Behavior.
Removes:
- The need to do checkIsFatal on other parts of the code
- SCFatalFail/ConnFatalFail states which are no longer needed.
With this:
- Is no longer necessary to pass observer as an argument
to every function that needs observations.
- We can invoke the observer on every function that uses AppConfig.
However it'd be better to just call the observer in the upper modules
(like on App.hs).
steve-chavez