release: update the cos_customizer to reduce gpu sizes

Releasing the cos_customizer with a new change that downloads
the toolchain onto a scratch disk instead of a bootdisk.
The new version of the cos_customizer will be v20220823.

Change-Id: Iae772bf8b4df37980c7980b8703475c302e19fb2
Reviewed-on: https://cos-review.googlesource.com/c/cos/tools/+/36269
Cloud-Build: GCB Service account <228075978874@cloudbuild.gserviceaccount.com>
Tested-by: Nobel Barakat <nobelbarakat@google.com>
Reviewed-by: Robert Kolchmeyer <rkolchmeyer@google.com>
diff --git a/release/release-versions.yaml b/release/release-versions.yaml
index 366615f..efa15d5 100644
--- a/release/release-versions.yaml
+++ b/release/release-versions.yaml
@@ -1,9 +1,9 @@
 - staging_container_name: "cos-customizer"
   release_container_name: "cos-customizer"
-  build_commit: "de2cd69396d849726113c7be8131cd944681eed2"
+  build_commit: "b21f7c1e3246b3dafeb673ddf98c64c45fd2c775"
   release_tags:
     - "latest"
-    - "v20220627"
+    - "v20220823"
 - staging_container_name: "toolbox"
   release_container_name: "toolbox"
   build_commit: "ad3d535f2b6fe0708341d92524b6625e10192edf"