dozer: use deprecate! instead of discontinued

Casks/d/dozer.rb

@@ -7,6 +7,9 @@ cask "dozer" do
   desc "Tool to hide status bar icons"
   homepage "https://github.com/Mortennn/Dozer"
 
+  # upstream discussion, https://github.com/Mortennn/Dozer/issues/178
+  deprecate! date: "2023-11-26", because: :discontinued
+
   auto_updates true
   depends_on macos: ">= :high_sierra"
 
@@ -16,9 +19,4 @@ cask "dozer" do
     "~/Library/Application Support/com.mortennn.Dozer",
     "~/Library/Preferences/com.mortennn.Dozer.plist",
   ]
-
-  # upstream discussion, https://github.com/Mortennn/Dozer/issues/178
-  caveats do
-    discontinued
-  end
 end