cos/tools: update anthos-installer version

Update anthos-installer version to support preloading
multiple containers with multiple loaders

BUG=b/195021904
TEST=presubmit
RELEASE_NOTE=udpate anthos-installer to latest version

Change-Id: I3486bc4ef3851170d3823d479eba65d2fc9ea23f
Reviewed-on: https://cos-review.googlesource.com/c/cos/tools/+/22130
Cloud-Build: GCB Service account <228075978874@cloudbuild.gserviceaccount.com>
Reviewed-by: Roy Yang <royyang@google.com>
Reviewed-by: Varsha Teratipally <teratipally@google.com>
Tested-by: Varsha Teratipally <teratipally@google.com>
diff --git a/src/cmd/cos_customizer/install_packages.go b/src/cmd/cos_customizer/install_packages.go
index 0dfda54..28aceb4 100644
--- a/src/cmd/cos_customizer/install_packages.go
+++ b/src/cmd/cos_customizer/install_packages.go
@@ -27,7 +27,7 @@
 )
 
 const (
-	anthosInstallerVersion       = "anthos_installer-linux-amd64-v0.0.1-6f32aca.tar.gz"
+	anthosInstallerVersion       = "anthos_installer-linux-amd64-v0.0.1-ab3b833.tar.gz"
 	anthosInstallerReleaseBucket = "cos-anthos-builds-us"
 )
 
diff --git a/testing/install_packages_test/pkgspec/preload-container.yaml b/testing/install_packages_test/pkgspec/preload-container.yaml
index 82019a9..fa170c4 100644
--- a/testing/install_packages_test/pkgspec/preload-container.yaml
+++ b/testing/install_packages_test/pkgspec/preload-container.yaml
@@ -1,8 +1,8 @@
 name: "calico-node"
 kind: container
-remoteurl: docker.io/calico/node
 distro: cos
-loader: docker
+loaders:
+- name: docker
 filemap:
 - source: docker.io/calico/node:v3.11.2
   type: container