[ci] Remove redundant comment.

Author: Chris Cummins

.github/workflows/ci.yaml

@@ -59,7 +59,6 @@ jobs:
                   else
                     wget https://github.com/llvm/llvm-project/releases/download/llvmorg-10.0.0/clang+llvm-10.0.0-x86_64-linux-gnu-ubuntu-18.04.tar.xz -O ~/llvm.tar.xz
                   fi
-                  # TODO(cummins): Remove 'v' debugging flag:
                   mkdir ~/llvm && tar xvf ~/llvm.tar.xz --strip-components 1 -C ~/llvm
                   rm ~/llvm.tar.xz
                   echo "Unpacked, testing for expected file:"