Update docker.elastic.co/logstash/logstash Docker tag to v9.1.1 (#1340)

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

Author: renovate[bot]

docker/logstash-probateman/Dockerfile

@@ -1,3 +1,3 @@
-FROM docker.elastic.co/logstash/logstash:9.1.0
+FROM docker.elastic.co/logstash/logstash:9.1.1
 RUN mkdir drivers
 RUN curl -o ./postgresql-42.2.2.jar https://jdbc.postgresql.org/download/postgresql-42.2.2.jar

docker/logstash/Dockerfile

@@ -1,3 +1,3 @@
-FROM docker.elastic.co/logstash/logstash:9.1.0
+FROM docker.elastic.co/logstash/logstash:9.1.1
 RUN mkdir drivers
 RUN curl -o ./drivers/postgresql-42.2.5.jar https://jdbc.postgresql.org/download/postgresql-42.2.5.jar