Update cos-gpu-installer to v2.0.26

Update for K80 driver GPU fallback behavior.

BUG=b/240587402
TEST=presubmit
RELEASE_NOTE=Updated cos-gpu-installer to v2.0.26. This resolves the
compatibility issue with K80 GPU devices. When an incompatible driver
version (R510+) is chosen in an instance with K80 GPU, the installer
will automatically fall back to an available R470 driver version.

Change-Id: I44b4b245d2aa317f3b8e951ea4c2dcec42590708
Reviewed-on: https://cos-review.googlesource.com/c/cos/overlays/board-overlays/+/36649
Reviewed-by: Arnav Kansal <rnv@google.com>
Tested-by: Cusky Presubmit Bot <presubmit@cos-infra-prod.iam.gserviceaccount.com>
Reviewed-by: Robert Kolchmeyer <rkolchmeyer@google.com>
diff --git a/project-lakitu/app-admin/extensions-manager/extensions-manager-0.0.1-r17.ebuild b/project-lakitu/app-admin/extensions-manager/extensions-manager-0.0.1-r18.ebuild
similarity index 100%
rename from project-lakitu/app-admin/extensions-manager/extensions-manager-0.0.1-r17.ebuild
rename to project-lakitu/app-admin/extensions-manager/extensions-manager-0.0.1-r18.ebuild
diff --git a/project-lakitu/app-admin/extensions-manager/files/cos-extensions.sh b/project-lakitu/app-admin/extensions-manager/files/cos-extensions.sh
index 8ecc6bd..8321366 100755
--- a/project-lakitu/app-admin/extensions-manager/files/cos-extensions.sh
+++ b/project-lakitu/app-admin/extensions-manager/files/cos-extensions.sh
@@ -15,7 +15,7 @@
 readonly OS_RELEASE="/etc/os-release"
 readonly EXTENSIONS_CACHE="/var/lib/cos-extensions"
 readonly ARTIFACT_REGISTRY_REGIONS=("us" "eu" "asia")
-DEFAULT_GPU_INSTALLER="gcr.io/cos-cloud/cos-gpu-installer:v2.0.25"
+DEFAULT_GPU_INSTALLER="gcr.io/cos-cloud/cos-gpu-installer:v2.0.26"
 
 COS_GPU_INSTALLER="${COS_GPU_INSTALLER:-}"