Make deps target public

rules_rust depends on this, and our stardoc build is sad if we don't
have a dep on it.

BUILD.bazel

@@ -25,6 +25,7 @@ bzl_library(
 bzl_library(
     name = "deps",
     srcs = ["deps.bzl"],
+    visibility = ["//visibility:public"],
     deps = [
         "//private:repos",
         "@bazel_tools//tools/build_defs/repo:http.bzl",