Strategy#page_content: allow cURL to --fail-with-body

since `curl_output` (introduced in #15351) sets `show_output: true`,
it doesn’t let it unless some form of --fail[...] is passed explicitly

Library/Homebrew/livecheck/strategy.rb

@@ -58,6 +58,9 @@ module Homebrew
       # `curl` arguments used in `Strategy#page_content` method.
       PAGE_CONTENT_CURL_ARGS = ([
         "--compressed",
+        # Allow the return of an error code on exit, so that we can retry
+        # with a fake UA string (e.g. for Cloudflare-protected sites)
+        "--fail-with-body",
         # Include HTTP response headers in output, so we can identify the
         # final URL after any redirections
         "--include",