Update openjdk in CI image

Author: danrmiller

Dockerfile

@@ -20,7 +20,7 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
       ocl-icd-opencl-dev opencl-headers valac zlib1g-dev \
       g++-aarch64-linux-gnu gcc-aarch64-linux-gnu \
       g++-mingw-w64-x86-64 gcc-mingw-w64-x86-64 \
-      openjdk-17-jdk-headless \
+      openjdk-21-jdk-headless \
  && rm -rf /var/lib/apt/lists/*
 
 RUN curl -fsSL https://deb.nodesource.com/setup_24.x | bash - \
@@ -38,7 +38,7 @@ RUN curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs \
  && cargo install cargo-ndk \
  && chmod -R a+rwX "$CARGO_HOME" "$RUSTUP_HOME"
 
-ENV JAVA_HOME=/usr/lib/jvm/java-17-openjdk-amd64
+ENV JAVA_HOME=/usr/lib/jvm/java-21-openjdk-amd64
 
 ENV ANDROID_SDK_ROOT=/opt/android-sdk \
     ANDROID_HOME=/opt/android-sdk \