[Thirdparty] Upgrade bazel-skylib to support config_setting_group.

Author: liutongxuan

WORKSPACE

@@ -73,8 +73,8 @@ http_archive(
 )  # https://github.com/bazelbuild/apple_support/releases
 http_archive(
     name = "bazel_skylib",
-    sha256 = "2ef429f5d7ce7111263289644d233707dba35e39696377ebab8b0bc701f7818e",
-    urls = ["https://github.com/bazelbuild/bazel-skylib/releases/download/0.8.0/bazel-skylib.0.8.0.tar.gz"],
+    sha256 = "1c531376ac7e5a180e0237938a2536de0c54d93f5c278634818e0efc952dd56c",
+    urls = ["https://github.com/bazelbuild/bazel-skylib/releases/download/1.0.3/bazel-skylib-1.0.3.tar.gz"],
 )  # https://github.com/bazelbuild/bazel-skylib/releases
 http_archive(
     name = "com_github_apple_swift_swift_protobuf",