use rules_license for defining the license of this repository

- this helps with generating better SBOMs than the old built-in
  `licenses` attribute

BUILD.bazel

@@ -30,12 +30,23 @@
 #
 #   Bazel Build for Google C++ Testing Framework(Google Test)
 
-package(default_visibility = ["//visibility:public"])
+load("@rules_license//rules:license.bzl", "license")
+
+package(
+    default_applicable_licenses = [":license"],
+    default_visibility = ["//visibility:public"],
+)
 
 licenses(["notice"])
 
 exports_files(["LICENSE"])
 
+license(
+    name = "license",
+    license_kinds = ["@rules_license//licenses/spdx:BSD-3-Clause"],
+    license_text = "LICENSE",
+)
+
 config_setting(
     name = "qnx",
     constraint_values = ["@platforms//os:qnx"],

MODULE.bazel

@@ -58,6 +58,11 @@ bazel_dep(
     dev_dependency = True,
 )
 
+bazel_dep(
+    name = "rules_license",
+    version = "1.0.0",
+)
+
 # https://rules-python.readthedocs.io/en/stable/toolchains.html#library-modules-with-dev-only-python-usage
 python = use_extension(
     "@rules_python//python/extensions:python.bzl",