chore(deps): update docker.elastic.co/logstash/logstash docker tag to v9 (#889)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

aws-cloudwatch-project/docker/docker-compose-elk.yml

@@ -17,7 +17,7 @@ services:
       - "9300:9300"
 
   logstash:
-    image: docker.elastic.co/logstash/logstash:8.18.3
+    image: docker.elastic.co/logstash/logstash:9.0.3
     container_name: logstash
     command: logstash -f /etc/logstash/conf.d/logstash.conf
     volumes: