reverted changes, specified rdkafka ext version

Author: ruzakaranbol

docker/dev/php/Dockerfile

@@ -31,7 +31,7 @@ RUN curl -sS https://getcomposer.org/installer | php -- --install-dir=/usr/bin -
 
 # PHP: Install php extensions
 RUN pecl channel-update pecl.php.net && \
-    pecl install rdkafka-6.0.0 pcov && \
+    pecl install rdkafka-6.0.1 pcov && \
     docker-php-ext-install pcntl && \
     php-ext-enable rdkafka pcntl pcov
 

src/Consumer/AbstractKafkaConsumer.php

@@ -230,7 +230,7 @@ protected function getConsumerMessage(RdKafkaMessage $message): KafkaConsumerMes
             (int) $message->timestamp,
             $message->key,
             $message->payload,
-            (array) ($message->headers ?? null)
+            (array) $message->headers
         );
     }