cos-tools: release cos-gpu-installer v2.6.8

Updated golang update to v2.62.

BUG=b/505849586
TEST=cloudbuild

Change-Id: I6d1a7488f3aef2f24e8994fd0be99841573e1c41
Reviewed-on: https://cos-review.googlesource.com/c/cos/tools/+/148164
Cloud-Build: 228075978874@cloudbuild.gserviceaccount.com <228075978874@cloudbuild.gserviceaccount.com>
Tested-by: Angel Adetula <angeladetula@google.com>
Reviewed-by: Derek Taylor <ddtaylor@google.com>

release/release-versions.yaml

diff --git a/release/release-versions.yaml b/release/release-versions.yaml
index 7686cda..9aa17d5 100644
--- a/release/release-versions.yaml
+++ b/release/release-versions.yaml
@@ -28,9 +28,9 @@
   multi-arch: true
 - staging_container_name: "cos-gpu-installer"
   release_container_name: "cos-gpu-installer"
-  build_tag: "b604763-a177a909-1926-4a6d-b2bd-5c7173b06860"
+  build_tag: "8048b23-4d784748-74b1-43e8-a826-01ea5922b9d1"
   release_tags:
-    - "v2.6.7"
+    - "v2.6.8"
   multi-arch: true
 - staging_container_name: "cos-gpu-driver-builder"
   release_container_name: "cos-gpu-driver-builder"