audit: deprecate AmazonWebServicesFormula

Closes Homebrew/homebrew#37355.

Signed-off-by: Xu Cheng <xucheng@me.com>

Library/Homebrew/cmd/audit.rb

@@ -133,6 +133,10 @@ class FormulaAuditor
     if formula.class < GithubGistFormula
       problem "GithubGistFormula is deprecated, use Formula instead"
     end
+
+    if formula.class < AmazonWebServicesFormula
+      problem "AmazonWebServicesFormula is deprecated, use Formula instead"
+    end
   end
 
   @@aliases ||= Formula.aliases