Update bazel_skylib to 1.8.1

modules/buf/MODULE.bazel

diff --git a/modules/buf/MODULE.bazel b/modules/buf/MODULE.bazel
index 7fcc761..7c6e8cb 100644
--- a/modules/buf/MODULE.bazel
+++ b/modules/buf/MODULE.bazel
@@ -4,7 +4,7 @@
     compatibility_level = 1,
 )
 
-bazel_dep(name = "bazel_skylib", version = "1.8.0")
+bazel_dep(name = "bazel_skylib", version = "1.8.1")
 bazel_dep(name = "protobuf", version = "31.1")
 bazel_dep(name = "rules_proto_grpc", version = "0.0.0.rpg.version.placeholder")
 bazel_dep(name = "rules_shell", version = "0.5.0")

modules/core/MODULE.bazel

diff --git a/modules/core/MODULE.bazel b/modules/core/MODULE.bazel
index c376eb8..5279d63 100644
--- a/modules/core/MODULE.bazel
+++ b/modules/core/MODULE.bazel
@@ -4,7 +4,7 @@
     compatibility_level = 1,
 )
 
-bazel_dep(name = "bazel_skylib", version = "1.8.0")
+bazel_dep(name = "bazel_skylib", version = "1.8.1")
 bazel_dep(name = "platforms", version = "1.0.0")
 bazel_dep(name = "protobuf", version = "31.1")
 bazel_dep(name = "rules_cc", version = "0.1.2")  # For fixer