revert java sdk to 21

Author: gockle

deployment/ecr/distributed-load-testing-on-aws-load-tester/Dockerfile

@@ -1,7 +1,7 @@
 FROM public.ecr.aws/amazonlinux/amazonlinux:2023-minimal
 
 RUN dnf update -y && \
-    dnf install -y python3.11 python3.11-pip java-11-amazon-corretto bc procps jq findutils unzip && \
+    dnf install -y python3.11 python3.11-pip java-21-amazon-corretto bc procps jq findutils unzip && \
     dnf clean all
 
 ENV PIP_INSTALL="pip3.11 install --no-cache-dir"