ci: sparc64: fix 'cannot find libc' error

Signed-off-by: Pedro Tammela <pctammela@gmail.com>

(backport <#4317>)
(cherry picked from commit 1ae6552)

Author: tammela

ci/docker/sparc64-unknown-linux-gnu/Dockerfile

@@ -1,11 +1,4 @@
-# FIXME(sparc): newer versions of Ubuntu get the following errors
-# ```
-# /prog: /lib/sparc64-linux-gnu/libm.so.6: version `GLIBC_2.38' not found (required by /prog)
-# /prog: /lib/sparc64-linux-gnu/libc.so.6: version `GLIBC_2.39' not found (required by /prog)
-# ```
-# Not sure if this is a problem from rustc, our libc, or Ubuntu so we just
-# stick with an old LTS for now.
-FROM ubuntu:22.04
+FROM ubuntu:24.10
 
 RUN apt-get update && apt-get install -y --no-install-recommends \
         curl ca-certificates \

ci/linux-sparc64.sh

@@ -5,11 +5,11 @@ set -eux
 mkdir -m 777 /qemu
 cd /qemu
 
-curl --retry 5 -LO https://cdimage.debian.org/cdimage/ports/snapshots/2022-12-09/debian-11.0.0-sparc64-NETINST-1.iso
-7z e debian-11.0.0-sparc64-NETINST-1.iso install/initrd.gz
-7z e debian-11.0.0-sparc64-NETINST-1.iso install/vmlinux
+curl --retry 5 -LO https://cdimage.debian.org/cdimage/ports/snapshots/2024-12-24/debian-12.0.0-sparc64-NETINST-1.iso
+7z e debian-12.0.0-sparc64-NETINST-1.iso install/initrd.gz
+7z e debian-12.0.0-sparc64-NETINST-1.iso install/vmlinux
 mv vmlinux kernel
-rm debian-11.0.0-sparc64-NETINST-1.iso
+rm debian-12.0.0-sparc64-NETINST-1.iso
 
 mkdir init
 cd init