Update upgrade branch config

As explained in f2100830 RPi4 had a different layout with not enough space
to perform kernel updates. Unfortunately this was properly fixed after the
release of v2023.5 so, to in order to perform the test use a different image
which has been published only for this purpose, which is based on v2023.5
but with the new layout.

Signed-off-by: Walter Lozano <walter.lozano@collabora.com>
[Martyn Welch: Backported to v2024]
Signed-off-by: Martyn Welch <martyn.welch@collabora.com>

lava/config.yaml

@@ -8,8 +8,8 @@ variables:
   upgradable_url_prefix: "https://images.apertis.org/release"
   # Any release listed here MUST be in the OSTree ref-bindings in apertis-image-recipes:
   # https://gitlab.apertis.org/infrastructure/apertis-image-recipes/-/blob/apertis/v2024/ostree-commit.yaml
-  upgradable_release: "v2022"
-  upgradable_build: "0"
+  upgradable_release: "v2023"
+  upgradable_build: "5test"
   arch: amd64
   visibility: public
   priority: medium