Update dependency rules_pkg to v0.8.1

Author: renovate[bot]

internal_deps.bzl

@@ -13,10 +13,10 @@ def toolchain_chromium_internal_deps():
         http_archive,
         name = "rules_pkg",
         urls = [
-            "https://mirror.bazel.build/github.com/bazelbuild/rules_pkg/releases/download/0.2.4/rules_pkg-0.2.4.tar.gz",
-            "https://github.com/bazelbuild/rules_pkg/releases/download/0.2.4/rules_pkg-0.2.4.tar.gz",
+            "https://mirror.bazel.build/github.com/bazelbuild/rules_pkg/releases/download/0.8.1/rules_pkg-0.8.1.tar.gz",
+            "https://github.com/bazelbuild/rules_pkg/releases/download/0.8.1/rules_pkg-0.8.1.tar.gz",
         ],
-        sha256 = "4ba8f4ab0ff85f2484287ab06c0d871dcb31cc54d439457d28fd4ae14b18450a",
+        sha256 = "8c20f74bca25d2d442b327ae26768c02cf3c99e93fad0381f32be9aab1967675",
     )
 
     maybe(