bsdiff: fix/improve urls

Formula/bsdiff.rb

@@ -1,15 +1,13 @@
 class Bsdiff < Formula
   desc "Generate and apply patches to binary files"
   homepage "https://www.daemonology.net/bsdiff"
-  url "https://www.daemonology.net/bsdiff/bsdiff-4.3.tar.gz"
+  # Returns 403 (forbidden) for the canonical download URL:
+  # "https://www.daemonology.net/bsdiff/bsdiff-4.3.tar.gz"
+  url "https://deb.debian.org/debian/pool/main/b/bsdiff/bsdiff_4.3.orig.tar.gz"
   sha256 "18821588b2dc5bf159aa37d3bcb7b885d85ffd1e19f23a0c57a58723fea85f48"
 
-  # We use the HTTP URL for the homepage here because the site redirects this
-  # from HTTPS to HTTP, which makes open-uri give a "redirection forbidden"
-  # error. The site supports HTTPS, it just doesn't want to use it for the
-  # bsdiff page, for whatever reason.
   livecheck do
-    url "http://www.daemonology.net/bsdiff"
+    url :homepage
     regex(/href=.*?bsdiff[._-]v?(\d+(?:\.\d+)+)\.t/i)
   end