chore: use LLVM default version (16) over pinned version 11

This cleans up the clang-tools_11 attribute, affects tazjin's frog and
aspen's home-manager configuration. achilles remains with pinned
llvmPackages, but it doesn't build at the moment, so it's impossible to
test.

Change-Id: I53416bf7c99f363163de29b32678a82b9eb5adbd
Reviewed-on: https://cl.tvl.fyi/c/depot/+/10644
Autosubmit: sterni <sternenseemann@systemli.org>
Reviewed-by: aspen <root@gws.fyi>
Reviewed-by: flokli <flokli@flokli.de>
Tested-by: BuildkiteCI
Reviewed-by: tazjin <tazjin@tvl.su>

users/tazjin/nixos/frog/default.nix

@@ -221,8 +221,8 @@ lib.fix (self: {
       bat
       chromium
       clang-manpages
-      clang-tools_11
-      clang_11
+      clang-tools
+      clang
       curl
       direnv
       dnsutils