cling: deprecate

Does not build on Ventura
I asked for a new release in May 2023, the response was not super clear:
root-project/cling#492 (comment)

The comments on #131473
did also not really look helpful.

Download count is low, so deprecating is the best thing to do, and
gives upstream some more time to react before removal on our side.

Formula/c/cling.rb

@@ -21,6 +21,11 @@ class Cling < Formula
     sha256               x86_64_linux:   "315073c45b0684a970493476b9c8476ddf90eb7d69bd5326efdf97b79ec55e25"
   end
 
+  # Does not build on Ventura
+  # https://github.com/Homebrew/homebrew-core/pull/131473
+  # https://github.com/root-project/cling/issues/492#issuecomment-1555938334
+  deprecate! date: "2023-08-24", because: :does_not_build
+
   depends_on "cmake" => :build
 
   uses_from_macos "libxml2"