[www-scripts] Clang Attribute Doc Update: ERROR

[root via www-scripts]

UPDATING LLVM SOURCES
HEAD is now at 7f1b2a6 [X86] AMX intrinsics should have ImmArg for the register numbers and use timm in isel patterns.
>From https://github.com/llvm/llvm-project
 * branch            master     -> FETCH_HEAD
   7f1b2a6..667dfe3  master     -> origin/master
First, rewinding head to replay your work on top of it...
Fast-forwarded master to 667dfe39caa0023b1d00b3e126c7df57702aaf14.
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!