Update Buildifier to 3.2.1

Change-Id: I9b506dc77cb027e07f10cae0a730619da52a905a
diff --git a/jenkins-docker/slave-bazel-nocache/Makefile b/jenkins-docker/slave-bazel-nocache/Makefile
index 6d973c2..af9bac0 100644
--- a/jenkins-docker/slave-bazel-nocache/Makefile
+++ b/jenkins-docker/slave-bazel-nocache/Makefile
@@ -3,7 +3,7 @@
 NO_CACHE=false
 IMAGE=gerritforge/gerrit-ci-slave-bazel:debian-stretch-nocache
 BAZEL_VER=3.1.0
-BUILDIFIER_VER=3.0.0
+BUILDIFIER_VER=3.2.1
 BAZELISK_VER=1.4.0
 NODE_VER=10
 WCT_VER=6.8.0