bug #50599 [MonologBridge] widen return type for Monolog 3 compatibil…

…ity (xabbuh)

This PR was merged into the 6.3 branch.

Discussion
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[MonologBridge] widen return type for Monolog 3 compatibility

| Q             | A
| ------------- | ---
| Branch?       | 6.3
| Bug fix?      | yes
| New feature?  | no
| Deprecations? | no
| Tickets       | Fix #50121 (comment)
| License       | MIT
| Doc PR        |

Commits
-------

40a8561 widen return type for Monolog 3 compatibility

src/Symfony/Bridge/Monolog/Handler/NotifierHandler.php

@@ -71,7 +71,7 @@ private function notify(array $records): void
         $this->notifier->send($notification, ...$this->notifier->getAdminRecipients());
     }
 
-    private function getHighestRecord(array $records): array
+    private function getHighestRecord(array $records): array|LogRecord
     {
         $highestRecord = null;
         foreach ($records as $record) {