clang: update to clang-13

clang-13 is now released:
    https://github.com/llvm/llvm-project/releases/tag/llvmorg-13.0.0

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Signed-off-by: Ed Tanous <edtanous@google.com>
Change-Id: Ia6171c192031e7522030c6c3053a322c55c65d52
2 files changed