[www-scripts] Clang Attribute Doc Update: ERROR

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UPDATING LLVM SOURCES
HEAD is now at fb04d7b [CUDA][HIP] Do not externalize implicit constant static variable
>From https://github.com/llvm/llvm-project
 * branch            master     -> FETCH_HEAD
   fb04d7b..6fd30f0  master     -> origin/master
First, rewinding head to replay your work on top of it...
Fast-forwarded master to 6fd30f0669a2dd9af7b87325e30ec1af79b86f28.
CMake Error at CMakeLists.txt:3 (cmake_minimum_required):
  CMake 3.13.4 or higher is required.  You are running version 3.7.1


-- Configuring incomplete, errors occurred!