refactor: use AppState.releasePool everywhere

This prepares for wrapping the pool in a reference.

src/PostgREST/CLI.hs

@@ -55,7 +55,7 @@ dumpSchema appState = do
           (toList configDbSchemas)
           configDbExtraSearchPath
           configDbPreparedStatements
-  SQL.release $ AppState.getPool appState
+  AppState.releasePool appState
   case result of
     Left e -> do
       hPutStrLn stderr $ "An error ocurred when loading the schema cache:\n" <> show e

src/PostgREST/Workers.hs

@@ -110,7 +110,7 @@ connectionWorker appState = do
 connectionStatus :: AppState -> IO ConnectionStatus
 connectionStatus appState =
   retrying retrySettings shouldRetry $
-    const $ SQL.release pool >> getConnectionStatus
+    const $ AppState.releasePool appState >> getConnectionStatus
   where
     pool = AppState.getPool appState
     retrySettings = capDelay delayMicroseconds $ exponentialBackoff backoffMicroseconds