Bump bazel to 0.25.0

Change-Id: I430c4838bf88e8f292ec41c3d9198b79380de5c3
diff --git a/jenkins-docker/slave-bazel-nocache/Makefile b/jenkins-docker/slave-bazel-nocache/Makefile
index c80e497..6a7e33e 100644
--- a/jenkins-docker/slave-bazel-nocache/Makefile
+++ b/jenkins-docker/slave-bazel-nocache/Makefile
@@ -1,6 +1,6 @@
 NO_CACHE=false
 IMAGE=gerritforge/gerrit-ci-slave-bazel:debian-stretch-nocache
-BAZEL_VER=0.22.0
+BAZEL_VER=0.25.0
 BUILDIFIER_VER=0.22.0
 
 # Targets