Changing bazel skylib version from 1.2.1 to 1.3.0 (#10979)

This intends to be a first step solving issue #10965 and #2530. It just updates bazel skylib to version 1.3.0.

Closes #10979

COPYBARA_INTEGRATE_REVIEW=https://github.com/protocolbuffers/protobuf/pull/10979 from Clement-Jean:skylib-update 607e249399
PiperOrigin-RevId: 490013583

protobuf_deps.bzl

@@ -30,10 +30,10 @@ def protobuf_deps():
         http_archive(
             name = "bazel_skylib",
             urls = [
-                "https://mirror.bazel.build/github.com/bazelbuild/bazel-skylib/releases/download/1.2.1/bazel-skylib-1.2.1.tar.gz",
-                "https://github.com/bazelbuild/bazel-skylib/releases/download/1.2.1/bazel-skylib-1.2.1.tar.gz",
+                "https://mirror.bazel.build/github.com/bazelbuild/bazel-skylib/releases/download/1.3.0/bazel-skylib-1.3.0.tar.gz",
+                "https://github.com/bazelbuild/bazel-skylib/releases/download/1.3.0/bazel-skylib-1.3.0.tar.gz",
             ],
-            sha256 = "f7be3474d42aae265405a592bb7da8e171919d74c16f082a5457840f06054728",
+            sha256 = "74d544d96f4a5bb630d465ca8bbcfe231e3594e5aae57e1edbf17a6eb3ca2506",
         )
 
     if not native.existing_rule("com_google_absl"):