formula: change how #to_hash is defined for backwards compatibility

Now the output of commands like `brew info --json=` and
`brew generate-formula-api` should be the same as before along with
the additional files for the internal API. Before this commit the
hash key order had changed.

Library/Homebrew/formula.rb

@@ -2238,7 +2238,13 @@ class Formula
       "keg_only"                 => keg_only?,
       "keg_only_reason"          => keg_only_reason&.to_hash,
       "options"                  => [],
-      **dependencies_hash,
+      "build_dependencies"       => [],
+      "dependencies"             => [],
+      "test_dependencies"        => [],
+      "recommended_dependencies" => [],
+      "optional_dependencies"    => [],
+      "uses_from_macos"          => [],
+      "uses_from_macos_bounds"   => [],
       "requirements"             => serialized_requirements,
       "conflicts_with"           => conflicts.map(&:name),
       "conflicts_with_reasons"   => conflicts.map(&:reason),
@@ -2267,6 +2273,8 @@ class Formula
       { "option" => opt.flag, "description" => opt.description }
     end
 
+    hsh.merge!(dependencies_hash)
+
     hsh["installed"] = installed_kegs.sort_by(&:version).map do |keg|
       tab = Tab.for_keg keg
       {
@@ -2307,7 +2315,7 @@ class Formula
                .transform_values(&:presence)
                .compact
 
-    api_hash.merge(dep_hash)
+    api_hash.merge!(dep_hash)
 
     # Exclude default values.
     api_hash["revision"] = revision unless revision.zero?