[9.x] fix: bring back old behaviour

src/Illuminate/Database/Connection.php

@@ -869,6 +869,7 @@ protected function fireConnectionEvent($event)
             'beganTransaction' => new TransactionBeginning($this),
             'committed' => new TransactionCommitted($this),
             'rollingBack' => new TransactionRolledBack($this),
+            default => null,
         });
     }
 

src/Illuminate/Notifications/RoutesNotifications.php

@@ -46,6 +46,7 @@ public function routeNotificationFor($driver, $notification = null)
         return match ($driver) {
             'database' => $this->notifications(),
             'mail' => $this->email,
+            default => null,
         };
     }
 }

src/Illuminate/Redis/RedisManager.php

@@ -171,6 +171,7 @@ protected function connector()
         return match ($this->driver) {
             'predis' => new PredisConnector,
             'phpredis' => new PhpRedisConnector,
+            default => null,
         };
     }