basex: update livecheck

The existing `livecheck` block for `basex` works but the first-party
download page links to the file we use in the `stable` URL, so it may
be better to check that. Theoretically, livecheck may surface a new
version before the download page is updated if upstream uploads the
files first, so checking the download page may be a more reliable
indicator that a version is released (if it's kept up to date).

Author: samford

Formula/b/basex.rb

@@ -7,8 +7,8 @@ class Basex < Formula
   license "BSD-3-Clause"
 
   livecheck do
-    url "https://files.basex.org/releases/"
-    regex(%r{href=.*?v?(\d+(?:\.\d+)+)/?["' >]}i)
+    url "https://basex.org/download/"
+    regex(%r{href=.*?/v?(\d+(?:\.\d+)+)/BaseX[._-]?v?(\d+(?:\.\d+)*)\.zip}i)
   end
 
   bottle do