Task: Fix deprecation warnings in CMake files

[jcarrete5]

Subject

When building the reference implementation, there are a few CMake warnings that are emitted and should be resolved:

CMake Warning (dev) at /usr/local/share/cmake/Modules/FetchContent.cmake:1953 (message):
   Calling FetchContent_Populate(googletest) is deprecated, call
   FetchContent_MakeAvailable(googletest) instead.  Policy CMP0169 can be set
   to OLD to allow FetchContent_Populate(googletest) to be called directly for
   now, but the ability to call it with declared details will be removed
   completely in a future version.
 Call Stack (most recent call first):
   CMakeLists.txt:36 (FetchContent_Populate)
 This warning is for project developers.  Use -Wno-dev to suppress it.
 CMake Deprecation Warning at build/_deps/googletest-src/CMakeLists.txt:4 (cmake_minimum_required):
   Compatibility with CMake < 3.10 will be removed from a future version of
   CMake.

   Update the VERSION argument <min> value.  Or, use the <min>...<max> syntax
   to tell CMake that the project requires at least <min> but has been updated
   to work with policies introduced by <max> or earlier.

 CMake Deprecation Warning at build/_deps/googletest-src/googlemock/CMakeLists.txt:39 (cmake_minimum_required):
   Compatibility with CMake < 3.10 will be removed from a future version of
   CMake.

   Update the VERSION argument <min> value.  Or, use the <min>...<max> syntax
   to tell CMake that the project requires at least <min> but has been updated
   to work with policies introduced by <max> or earlier.

 CMake Deprecation Warning at build/_deps/googletest-src/googletest/CMakeLists.txt:49 (cmake_minimum_required):
   Compatibility with CMake < 3.10 will be removed from a future version of
   CMake.

   Update the VERSION argument <min> value.  Or, use the <min>...<max> syntax
   to tell CMake that the project requires at least <min> but has been updated
   to work with policies introduced by <max> or earlier.

Notes (Optional)

No response