templates: update armv7l to use Ubuntu 23.04 (to match riscv64)

Signed-off-by: Akihiro Suda <[email protected]>

Author: AkihiroSuda

examples/experimental/armv7l.yaml

@@ -3,12 +3,12 @@
 arch: "armv7l"
 images:
 # Try to use release-yyyyMMdd image if available. Note that release-yyyyMMdd will be removed after several months.
-- location: "https://cloud-images.ubuntu.com/releases/22.04/release-20230518/ubuntu-22.04-server-cloudimg-armhf.img"
+- location: "https://cloud-images.ubuntu.com/releases/23.04/release-20230729/ubuntu-23.04-server-cloudimg-armhf.img"
   arch: "armv7l"
-  digest: "sha256:f9baf349e9f4bb4acc6cbd14dc82aa2aa514fd76e06c74678e5453f0e6717fd2"
+  digest: "sha256:ab0a4f4e9538694f6edc0e2f8bc18923ec364333dd2883377949d99e2f4788c6"
 # Fallback to the latest release image.
 # Hint: run `limactl prune` to invalidate the cache
-- location: "https://cloud-images.ubuntu.com/releases/22.04/release/ubuntu-22.04-server-cloudimg-armhf.img"
+- location: "https://cloud-images.ubuntu.com/releases/23.04/release/ubuntu-23.04-server-cloudimg-armhf.img"
   arch: "armv7l"
 
 mounts: