ci: update to ubuntu 25.04

Dockerfile.openj9

@@ -1,11 +1,11 @@
-FROM ubuntu:24.10 AS build
+FROM ubuntu:25.04 AS build
 
 # partly copied from mkdocker.sh
 # Copyright IBM Corp (Eclipse Public License 2.0)
 RUN apt update \
  && apt upgrade -y \
  && apt install -qq -y --no-install-recommends \
-      ant ant-contrib autoconf build-essential ca-certificates cmake cpio curl file g++-13 gcc-13 gdb git \
+      ant ant-contrib autoconf build-essential ca-certificates cmake cpio curl file g++-14 gcc-14 gdb git \
       libasound2-dev libcups2-dev libdwarf-dev libelf-dev libexpat1-dev libffi-dev libfontconfig libfontconfig1-dev \
       libfreetype6-dev libnuma-dev libssl-dev libx11-dev libxext-dev libxrandr-dev libxrender-dev libxt-dev libxtst-dev \
       make nasm pkg-config python3 python3-dev rsync systemtap-sdt-dev unzip wget xvfb zip zlib1g-dev \
@@ -24,7 +24,7 @@ RUN git clone --single-branch --depth 1 \
 
 WORKDIR /build/src
 RUN bash get_source.sh
-RUN bash configure --with-boot-jdk=/build/bootjdk --with-mixedrefs=static --with-openssl=system
+RUN bash configure --with-boot-jdk=/build/bootjdk --with-openssl=system
 RUN make all
 
 # jlink by advice from https://adoptium.net/blog/2021/10/jlink-to-produce-own-runtime/
@@ -44,7 +44,7 @@ RUN mv ./* /build/dist/
 
 # ------
 
-FROM ubuntu:24.10 AS run
+FROM ubuntu:25.04 AS run
 
 COPY --from=build /build/dist/jre /usr/lib/jvm/openj9-jre
 ENV JAVA_HOME=/usr/lib/jvm/openj9-jre