fix devcontainer build

Author: joeferner

.devcontainer/Dockerfile

@@ -1,4 +1,4 @@
 FROM mcr.microsoft.com/devcontainers/javascript-node:22
 
 # need to run update and install at the same time to prevent stale update layer
-RUN apt-get update && apt-get install -y gdb clang-format openjdk-17-jdk maven
+RUN apt-get update && apt-get install -y gdb clang-format openjdk-21-jdk maven