message: Add cmake_minimum_required to gtest.cmake.in
  Summary:
  Recent versions of CMake (e.g. 3.24.2) appear to fail unless the `cmake_minimum_required` version is set.  Furthermore, we set `project` to silence the corresponding warning.
  X-link:
diff: # This source code is licensed under the MIT license found in the
  # LICENSE file in the root directory of this source tree.
  +cmake_minimum_required(VERSION 3.0.2)
  +project("googletest")
  +
  include(ExternalProject)
  ExternalProject_Add(googletest
  GIT_REPOSITORY https://github.com/google/googletest.git
  