Check fopen() return type

It might be false instead a resource when command line is "Standard input code".

The shutup operator supresses a warning.

This is the case for EXT:typo3_console command:

./bin/typo3 frontend:request

Classes/Writer/JsonWriter.php

@@ -59,9 +59,11 @@ public function writeLog(LogRecord $record)
             $data['request_id'] = $_SERVER['X-REQUEST-ID'] ?? $_SERVER['HTTP_X_REQUEST_ID'] ?? null;
         }
 
-        $stderr = fopen('php://stderr', 'a');
-        fwrite($stderr, json_encode($data) . PHP_EOL);
-        fclose($stderr);
+        $stderr = @fopen('php://stderr', 'a');
+        if ($stderr) {
+            fwrite($stderr, json_encode($data) . PHP_EOL);
+            fclose($stderr);
+        }
 
         return $this;
     }