chore(deps): update hasql to 1.9.3.1

Michael and I arrived at mostly the same things independently. Took some
of his, some of mine.

Co-authored-by: Michal Kleczek <michal@kleczek.org>

src/PostgREST/Metrics.hs

@@ -53,7 +53,7 @@ observationMetrics MetricsState{..} obs = case obs of
   PoolAcqTimeoutObs -> do
     incCounter poolTimeouts
   (HasqlPoolObs (SQL.ConnectionObservation _ status)) -> case status of
-     SQL.ReadyForUseConnectionStatus  -> do
+     SQL.ReadyForUseConnectionStatus _ -> do
       incGauge poolAvailable
      SQL.InUseConnectionStatus        -> do
       decGauge poolAvailable