livecheck: Skip #preprocess_url for new strategies

I forgot to add the new `Json`, `Xml`, and `Yaml` strategies to the
list of strategies where `#preprocess_url` should be skipped and this
was causing issues for a user in their tap. This is unfortunately
another bug that wasn't surfaced when I tested all the related checks
in our first-party taps.

Library/Homebrew/livecheck/livecheck.rb

@@ -35,9 +35,12 @@ module Homebrew
     STRATEGY_SYMBOLS_TO_SKIP_PREPROCESS_URL = [
       :extract_plist,
       :github_latest,
-      :page_match,
       :header_match,
+      :json,
+      :page_match,
       :sparkle,
+      :xml,
+      :yaml,
     ].freeze
 
     UNSTABLE_VERSION_KEYWORDS = %w[