update pkg_tar to 0.3.x

Needed to unblock #8857

Closes #11270.

PiperOrigin-RevId: 366994484
diff --git a/distdir_deps.bzl b/distdir_deps.bzl
index 1cd689c..e64e2a7 100644
--- a/distdir_deps.bzl
+++ b/distdir_deps.bzl
@@ -203,11 +203,11 @@
         "strip_prefix": "stardoc-1ef781ced3b1443dca3ed05dec1989eca1a4e1cd",
     },
     "rules_pkg": {
-        "archive": "rules_pkg-0.2.4.tar.gz",
-        "sha256": "4ba8f4ab0ff85f2484287ab06c0d871dcb31cc54d439457d28fd4ae14b18450a",
+        "archive": "rules_pkg-0.4.0.tar.gz",
+        "sha256": "038f1caa773a7e35b3663865ffb003169c6a71dc995e39bf4815792f385d837d",
         "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/0.4.0/rules_pkg-0.4.0.tar.gz",
+            "https://github.com/bazelbuild/rules_pkg/releases/download/0.4.0/rules_pkg-0.4.0.tar.gz",
         ],
         "used_in": [
             "additional_distfiles",