update images to use go1.25.6

[cpanato]

No description provided.

[cpanato]

need to fix first: https://github.com/gythialy/golang-cross/actions/runs/21171613136/job/60889530775

ERROR: failed to build: failed to solve: process "/bin/sh -c if [ \"${OS_CODENAME}\" = \"trixie\" ]; then     apt-get update && apt-get install -y --no-install-recommends clang-18 &&     update-alternatives --install /usr/bin/clang clang /usr/bin/clang-18 100 &&     update-alternatives --install /usr/bin/clang++ clang++ /usr/bin/clang++-18 100;   else     ./llvm.sh 16 &&     update-alternatives --install /usr/bin/clang clang /usr/bin/clang-16 100 &&     update-alternatives --install /usr/bin/clang++ clang++ /usr/bin/clang++-16 100;   fi   && clang --version   && clang++ --version   && UNATTENDED=yes OSX_VERSION_MIN=${OSX_VERSION_MIN:-10.13} ./build.sh   && DISABLE_PARALLEL_ARCH_BUILD=1 ./build_compiler_rt.sh   && rm -rf *~ build *.tar.xz   && rm -rf ./.git   && ls -al \"${OSX_CROSS_PATH}/target/bin\"   && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*" did not complete successfully: exit code: 1

[cpanato]

need #396