Upgrade to a new Bazel version

This one has better performance and various new features. It also
prevents us from falling too far behind upstream.

Change-Id: I3b8e1c5bda886ea2e990523af9e6de2434c784be
diff --git a/tools/bazel.rc b/tools/bazel.rc
index 7df645e..7530102 100644
--- a/tools/bazel.rc
+++ b/tools/bazel.rc
@@ -46,3 +46,5 @@
 build --show_result 5
 # Dump the output of the failing test to stdout.
 test --test_output=errors
+
+build --experimental_sandbox_shm