Use Struct instead of Data

Author: soutaro

lib/rbs/ast/ruby/comment_block.rb

@@ -93,7 +93,7 @@ def self.build(buffer, comments)
           blocks
         end
 
-        AnnotationSyntaxError = _ = Data.define(:location, :error)
+        AnnotationSyntaxError = _ = Struct.new(:location, :error, keyword_init: true)
 
         def each_paragraph(variables, &block)
           if block