Bump Bazel version to 3.4.1

Change-Id: I56b80eaac44f6609e011f823b4f388ee0d2b13f4
diff --git a/jenkins-docker/slave-bazel-nocache/Makefile b/jenkins-docker/slave-bazel-nocache/Makefile
index 35a2ba6..e725761 100644
--- a/jenkins-docker/slave-bazel-nocache/Makefile
+++ b/jenkins-docker/slave-bazel-nocache/Makefile
@@ -2,7 +2,7 @@
 
 NO_CACHE=false
 IMAGE=gerritforge/gerrit-ci-slave-bazel:debian-stretch-nocache
-BAZEL_VER=3.1.0
+BAZEL_VER=3.4.1
 BUILDIFIER_VER=3.3.0
 BAZELISK_VER=1.5.0
 NODE_VER=10