[FLINK-16540] Fully specify bugfix version of Flink images in docker-compose.yaml

* Update Flink version to 1.9.2

This closes #10.
diff --git a/docker/ops-playground-image/Dockerfile b/docker/ops-playground-image/Dockerfile
index 59b40a0..d931804 100644
--- a/docker/ops-playground-image/Dockerfile
+++ b/docker/ops-playground-image/Dockerfile
@@ -32,7 +32,7 @@
 # Build Operations Playground Image
 ###############################################################################
 
-FROM flink:1.9.0-scala_2.11
+FROM flink:1.9.2-scala_2.11
 
 WORKDIR /opt/flink/bin
 
diff --git a/operations-playground/docker-compose.yaml b/operations-playground/docker-compose.yaml
index 5a88b98..270bb2d 100644
--- a/operations-playground/docker-compose.yaml
+++ b/operations-playground/docker-compose.yaml
@@ -20,7 +20,7 @@
 services:
   client:
     build: ../docker/ops-playground-image
-    image: apache/flink-ops-playground:2-FLINK-1.9-scala_2.11
+    image: apache/flink-ops-playground:3-FLINK-1.9-scala_2.11
     command: "flink run -d -p 2 /opt/ClickCountJob.jar --bootstrap.servers kafka:9092 --checkpointing --event-time"
     depends_on:
       - jobmanager
@@ -35,7 +35,7 @@
     depends_on:
       - kafka
   jobmanager:
-    image: flink:1.9-scala_2.11
+    image: flink:1.9.2-scala_2.11
     command: "jobmanager.sh start-foreground"
     ports:
       - 8081:8081
@@ -46,7 +46,7 @@
     environment:
       - JOB_MANAGER_RPC_ADDRESS=jobmanager
   taskmanager:
-    image: flink:1.9-scala_2.11
+    image: flink:1.9.2-scala_2.11
     depends_on:
       - jobmanager
     command: "taskmanager.sh start-foreground"