cos-gpu-installer: Release v2.5.9

The release yesterday was based on the wrong tag, which did not actually
have GB300 support. This includes the intended changes for GB300 support.

BUG=b/453749231
TEST=presubmit, on a4x-max run: `COS_GPU_INSTALLER=us-docker.pkg.dev/cos-infra-prod/gcr-io-staging/cos-gpu-installer:734afed-4e51602a-625b-432b-9266-b07a4ad3e30d cos-extensions install gpu -- --gcs-download-bucket=cos-infra-prod-artifacts-presubmit --gcs-download-prefix=lakitu-arm64-largemem-release-tryjob/R125-19216.91.0-842c38fd --version 580.95.05 --debug`

Change-Id: I62a07416bb884c0d11105eb3a8e63f1ad3d3c735
Reviewed-on: https://cos-review.googlesource.com/c/cos/tools/+/115502
Reviewed-by: Robert Kolchmeyer <rkolchmeyer@google.com>
Tested-by: Kevin Berry <kpberry@google.com>
Cloud-Build: GCB Service account <228075978874@cloudbuild.gserviceaccount.com>

release/release-versions.yaml

diff --git a/release/release-versions.yaml b/release/release-versions.yaml
index 02f33f9..50c8540 100644
--- a/release/release-versions.yaml
+++ b/release/release-versions.yaml
@@ -29,9 +29,9 @@
   multi-arch: false
 - staging_container_name: "cos-gpu-installer"
   release_container_name: "cos-gpu-installer"
-  build_tag: "3e241b3-58439c28-f208-43dd-8c79-3f371e5bf5c1"
+  build_tag: "734afed-4e51602a-625b-432b-9266-b07a4ad3e30d"
   release_tags:
-    - "v2.5.8"
+    - "v2.5.9"
   multi-arch: true
 - staging_container_name: "cos-gpu-driver-builder"
   release_container_name: "cos-gpu-driver-builder"