Updating the zk version to 3.8.4

Author: Ritika R Prasad

README.md

@@ -28,7 +28,7 @@ The project is currently alpha. While no breaking API changes are currently plan
 
 ### Overview
 
-This operator runs a Zookeeper 3.7.2 cluster, and uses Zookeeper dynamic reconfiguration to handle node membership.
+This operator runs a Zookeeper 3.8.4 cluster, and uses Zookeeper dynamic reconfiguration to handle node membership.
 
 The operator itself is built with the [Operator framework](https://github.com/operator-framework/operator-sdk).
 

docker/Dockerfile

@@ -15,7 +15,7 @@ COPY zu /zu
 WORKDIR /zu
 RUN ./gradlew --console=verbose --info shadowJar
 
-FROM ${DOCKER_REGISTRY:+$DOCKER_REGISTRY/}zookeeper:3.7.2
+FROM ${DOCKER_REGISTRY:+$DOCKER_REGISTRY/}zookeeper:3.8.4
 COPY bin /usr/local/bin
 RUN chmod +x /usr/local/bin/*
 COPY --from=0 /zu/build/libs/zu.jar /opt/libs/

docker/zu/build.gradle.kts

@@ -12,7 +12,7 @@ repositories {
 
 dependencies {
     implementation(kotlin("stdlib"))
-    implementation("org.apache.zookeeper:zookeeper:3.7.2")
+    implementation("org.apache.zookeeper:zookeeper:3.8.4")
 }
 
 tasks.withType<ShadowJar>() {