upgrade smart-servlet to 0.6-SNAPSHOT

frameworks/Java/smart-socket/smart-socket-smart-servlet.dockerfile

@@ -1,10 +1,10 @@
-FROM maven:3.6.1-jdk-11-slim as maven
+FROM maven:3.8.6-openjdk-18-slim as maven
 WORKDIR /smart-socket
 COPY pom.xml pom.xml
 COPY src src
 RUN mvn compile assembly:single -q
 
-FROM openjdk:11.0.3-jdk-slim
+FROM openjdk:21-jdk-slim
 WORKDIR /smart-socket
 COPY --from=maven /smart-socket/target/smart-socket-benchmark-1.0-jar-with-dependencies.jar app.jar