Mark objc api used in rules_apple as public

We need this to support Bazel 9+ (see: bazelbuild/rules_apple#2862)

Author: luispadron

cc/private/rules_impl/BUILD

@@ -96,7 +96,7 @@ bzl_library(
         "objc_intermediate_artifacts.bzl",
         "objc_semantics.bzl",
     ],
-    visibility = ["//cc:__subpackages__"],
+    visibility = ["//visibility:public"],
     deps = [
         "//cc/common",
         "@bazel_skylib//lib:paths",
@@ -106,10 +106,7 @@ bzl_library(
 bzl_library(
     name = "objc_compilation_support_bzl",
     srcs = ["objc_compilation_support.bzl"],
-    visibility = [
-        "//cc:__subpackages__",
-        "//third_party/bazel_rules/rules_apple/apple:__subpackages__",
-    ],
+    visibility = ["//visibility:public"],
     deps = [
         ":objc_common",
         "//cc/common:cc_helper_bzl",