Update jdk21 docker image tag to a supported dist (#128)

openjdk:21 deprecated
see here: see here: https://hub.docker.com/_/openjdk

Signed-off-by: Angelica Ochoa <15623749+ao508@users.noreply.github.com>

Author: ao508

Dockerfile

@@ -6,6 +6,6 @@ WORKDIR /label-generator
 RUN mvn clean install
 
 # copy jar and set entrypoint
-FROM openjdk:21
+FROM ibm-semeru-runtimes:open-21.0.9_10-jdk-jammy
 COPY --from=0 /label-generator/target/smile_label_generator.jar /label-generator/smile_label_generator.jar
 ENTRYPOINT ["java"]