toolbox: update docker-credential-gcr to 2.1.2

BUG=b/230823187

Change-Id: I2669ccba1a10eba13c5da6b321cdb9a25f798dcb
Reviewed-on: https://cos-review.googlesource.com/c/cos/tools/+/32268
Tested-by: Rayan Dasoriya <dasoriya@google.com>
Reviewed-by: He Gao <hegao@google.com>
Cloud-Build: GCB Service account <228075978874@cloudbuild.gserviceaccount.com>
diff --git a/src/cmd/toolbox/Dockerfile b/src/cmd/toolbox/Dockerfile
index c81a930..3594639 100644
--- a/src/cmd/toolbox/Dockerfile
+++ b/src/cmd/toolbox/Dockerfile
@@ -10,8 +10,8 @@
 
 ARG TARGETARCH
 
-RUN cd $(mktemp -d) && curl -L -O "https://github.com/GoogleCloudPlatform/docker-credential-gcr/releases/download/v2.1.0/docker-credential-gcr_linux_$TARGETARCH-2.1.0.tar.gz" && \
-    tar xvf "docker-credential-gcr_linux_$TARGETARCH-2.1.0.tar.gz" && \
+RUN cd $(mktemp -d) && curl -L -O "https://github.com/GoogleCloudPlatform/docker-credential-gcr/releases/download/v2.1.2/docker-credential-gcr_linux_$TARGETARCH-2.1.2.tar.gz" && \
+    tar xvf "docker-credential-gcr_linux_$TARGETARCH-2.1.2.tar.gz" && \
     mv docker-credential-gcr /usr/bin/ && rm -r $(pwd)
 
 # Install the Google Cloud SDK.