Use the latest Debian for SPARC64

Signed-off-by: Yuki Okushi <jtitor@2k36.org>

Author: JohnTitor

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

@@ -1,5 +1,4 @@
-# FIXME: Update to 22.04 once Debian image of sparc64 has a newer glibc.
-FROM ubuntu:20.04
+FROM ubuntu:22.04
 
 RUN apt-get update && apt-get install -y --no-install-recommends \
         curl ca-certificates \

ci/linux-sparc64.sh

@@ -5,7 +5,7 @@ set -ex
 mkdir -m 777 /qemu
 cd /qemu
 
-curl --retry 5 -LO https://cdimage.debian.org/cdimage/ports/snapshots/2022-03-28/debian-11.0.0-sparc64-NETINST-1.iso
+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
 mv vmlinux kernel