Update docker.elastic.co/logstash/logstash Docker tag to v8.19.21 - #73

Update docker.elastic.co/logstash/logstash Docker tag to v8.19.21#73

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renovate/docker.elastic.co-logstash-logstash-8.xIntsights/sergeant:renovate/docker.elastic.co-logstash-logstash-8.xCopy head branch name to clipboard