Bump Bazel version to 3.7.0

This release has these changes [1]. Skip the 3.6.0 release [2], as both
happened quickly compared to the pace of this maintenance. Notes [1,2]
are linked from [3], alongside changes that were cherry-picks.

[1] https://blog.bazel.build/2020/10/20/bazel-3-7.html
[2] https://blog.bazel.build/2020/10/06/bazel-3-6.html
[3] https://github.com/bazelbuild/bazel/releases

Change-Id: I905507782148ed5f5033b167cf2d6594f7d233f4
diff --git a/jenkins-docker/slave-bazel-nocache/Makefile b/jenkins-docker/slave-bazel-nocache/Makefile
index ff983a7..7d5325e 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-buster-nocache
-BAZEL_VER=3.5.1
+BAZEL_VER=3.7.0
 BUILDIFIER_VER=3.5.0
 BAZELISK_VER=1.7.3
 NODE_VER=10