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/build_rules/ruby.bzl b/tools/build_rules/ruby.bzl
index 7c02745..2c93596 100644
--- a/tools/build_rules/ruby.bzl
+++ b/tools/build_rules/ruby.bzl
@@ -51,7 +51,7 @@
   ),
   'data': attr.label_list(
     allow_files = True,
-    cfg = DATA_CFG,
+    cfg = 'data',
   ),
 }
 
@@ -84,6 +84,7 @@
   attrs = _ruby_attrs + {
     '_ruby_linker': attr.label(
       executable = True,
+      cfg = 'host',
       default = Label('//tools/ruby:standalone_ruby'),
     )
   },