Update dependency bazel_skylib to v1.8.1

Author: renovate[bot]

WORKSPACE

@@ -7,10 +7,10 @@ load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
 # To update this version, copy-paste instructions from https://github.com/bazelbuild/bazel-skylib/releases
 http_archive(
     name = "bazel_skylib",
-    sha256 = "1c531376ac7e5a180e0237938a2536de0c54d93f5c278634818e0efc952dd56c",
+    sha256 = "51b5105a760b353773f904d2bbc5e664d0987fbaf22265164de65d43e910d8ac",
     urls = [
-        "https://github.com/bazelbuild/bazel-skylib/releases/download/1.0.3/bazel-skylib-1.0.3.tar.gz",
-        "https://mirror.bazel.build/github.com/bazelbuild/bazel-skylib/releases/download/1.0.3/bazel-skylib-1.0.3.tar.gz",
+        "https://github.com/bazelbuild/bazel-skylib/releases/download/1.8.1/bazel-skylib-1.8.1.tar.gz",
+        "https://mirror.bazel.build/github.com/bazelbuild/bazel-skylib/releases/download/1.8.1/bazel-skylib-1.8.1.tar.gz",
     ],
 )