message: Update Datadog tracer version to v0.4.1
diff: @@ -100,9 +100,9 @@ REPOSITORY_LOCATIONS = dict(
  urls = ["https://github.com/googleapis/googleapis/archive/d6f78d948c53f3b400bb46996eb3084359914f9b.tar.gz"],
  ),
  com_github_datadog_dd_opentracing_cpp = dict(
  - sha256 = "32967149fbc672f321ba6ce6c3e5cc299b15ab914f6f5b2993c7c9ddc1894439",
  - strip_prefix = "dd-opentracing-cpp-0.3.6",
  - urls = ["https://github.com/DataDog/dd-opentracing-cpp/archive/v0.3.6.tar.gz"],
  + sha256 = "1798ce816e389ad89c379cb734487ed8b7db3d909be0c8548bd96538f78639b7",
  + strip_prefix = "dd-opentracing-cpp-0.4.1",
  + urls = ["https://github.com/DataDog/dd-opentracing-cpp/archive/v0.4.1.tar.gz"],
  ),
  com_github_msgpack_msgpack_c = dict(
  sha256 = "bda49f996a73d2c6080ff0523e7b535917cd28c8a79c3a5da54fc29332d61d1e",
  