fix(postgres): prevent crash if postgres connection emits multiple er…

…rors (#15868)

src/dialects/postgres/connection-manager.js

@@ -203,7 +203,7 @@ class ConnectionManager extends AbstractConnectionManager {
     });
 
     // Don't let a Postgres restart (or error) to take down the whole app
-    connection.once('error', error => {
+    connection.on('error', error => {
       connection._invalid = true;
       debug(`connection error ${error.code || error.message}`);
       this.pool.destroy(connection);