Bug#1000892: cvise: Please upgrade to llvm-toolchain-12 or 13

[Peter Michael Green <plugwash@debian.org>]

severity 1000892 serious
thanks

> As part of the effort to limit the number of llvm packages in the
> archive, please upgrade to -13 (or -12).
>
> It has:
>   llvm-9-dev [armel armhf], libclang-9-dev [armel armhf], clang-9 [armel armhf], clang-format-9 [armel armhf],
>       
      llvm-toolchain-9 has now been removed from testing, so this is now
      a violation of the rc policy
      "packages must be buildable within the same release.