Update dependency bazel_skylib to v1.8.1

Author: renovate[bot]

tests/MODULE.bazel

@@ -20,7 +20,7 @@ local_path_override(
     path = "..",
 )
 
-bazel_dep(name = "bazel_skylib", version = "1.7.1")
+bazel_dep(name = "bazel_skylib", version = "1.8.1")
 bazel_dep(name = "platforms", version = "0.0.11")
 bazel_dep(name = "rules_cc", version = "0.0.9")
 bazel_dep(name = "rules_go", version = "0.50.1", repo_name = "io_bazel_rules_go")

toolchain/deps.bzl

@@ -29,10 +29,10 @@ def bazel_toolchain_dependencies():
         http_archive(
             name = "bazel_skylib",
             urls = [
-                "https://mirror.bazel.build/github.com/bazelbuild/bazel-skylib/releases/download/1.7.1/bazel-skylib-1.7.1.tar.gz",
-                "https://github.com/bazelbuild/bazel-skylib/releases/download/1.7.1/bazel-skylib-1.7.1.tar.gz",
+                "https://mirror.bazel.build/github.com/bazelbuild/bazel-skylib/releases/download/1.8.1/bazel-skylib-1.8.1.tar.gz",
+                "https://github.com/bazelbuild/bazel-skylib/releases/download/1.8.1/bazel-skylib-1.8.1.tar.gz",
             ],
-            sha256 = "bc283cdfcd526a52c3201279cda4bc298652efa898b10b4db0837dc51652756f",
+            sha256 = "51b5105a760b353773f904d2bbc5e664d0987fbaf22265164de65d43e910d8ac",
         )
 
         # Skip bazel_skylib_workspace because we are not using lib/unittest.bzl