launch4j: add livecheck

Closes #91054.

Signed-off-by: rui <rui@chenrui.dev>
Signed-off-by: BrewTestBot <1589480+BrewTestBot@users.noreply.github.com>

Formula/launch4j.rb

@@ -7,6 +7,14 @@ class Launch4j < Formula
   license all_of: ["BSD-3-Clause", "MIT"]
   revision 1
 
+  livecheck do
+    url :stable
+    regex(/^(?:Release_launch4j[._-])?v?(\d+(?:[._]\d+)+)$/i)
+    strategy :git do |tags, regex|
+      tags.map { |tag| tag[regex, 1]&.tr("_", ".") }
+    end
+  end
+
   bottle do
     sha256 cellar: :any_skip_relocation, monterey: "10fe31dd5081fecb626537d801e678e8921c5f8d655f7daee5e6c8dd2e2ef619"
     sha256 cellar: :any_skip_relocation, big_sur:  "4c6bfb289d9aeca25dbc25ff2f9fe12a49a635bf720fe54b788d4796c25bc108"