gauche: update livecheck

Closes #111608.

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

Formula/gauche.rb

@@ -8,8 +8,10 @@ class Gauche < Formula
 
   livecheck do
     url :stable
-    strategy :github_latest
-    regex(/href=.*?Gauche[._-]v?(\d+(?:\.\d+)+(?:[._-]p\d+)?)\.t/i)
+    regex(%r{href=["']?[^"' >]*?/tag/\D*?(\d+(?:[._]\d+)+(?:[._-]?p\d+)?)["' >]}i)
+    strategy :github_latest do |page, regex|
+      page.scan(regex).map { |match| match[0].tr("_", ".") }
+    end
   end
 
   bottle do