Update docker.elastic.co/elasticsearch/elasticsearch Docker tag to v8.19.21

Author: renovate[bot]

docker-compose.yml

@@ -65,7 +65,7 @@ services:
     restart: always
 
   elasticsearch:
-    image: docker.elastic.co/elasticsearch/elasticsearch:8.17.2@sha256:9fb5d27b49cb8d895209736d8e5d1bea4e0c2232c35874bf4c36628e9c7f7e54
+    image: docker.elastic.co/elasticsearch/elasticsearch:8.19.21@sha256:cbf5cd6cfe5532a9c02d510c66d238bf329cd51fe3d57170a2a880aca7d47419
     environment:
       - bootstrap.memory_lock=true
       - ES_JAVA_OPTS=-Xms2G -Xmx2G