Switch back to `Hash.dup`

Follow up to #26301.

activerecord/lib/active_record/table_metadata.rb

@@ -10,9 +10,7 @@ def initialize(klass, arel_table, association = nil)
     end
 
     def resolve_column_aliases(hash)
-      # This method is a hot spot, so for now, use Hash[] to dup the hash.
-      #   https://bugs.ruby-lang.org/issues/7166
-      new_hash = Hash[hash]
+      new_hash = hash.dup
       hash.each do |key, _|
         if (key.is_a?(Symbol)) && klass.attribute_alias?(key)
           new_hash[klass.attribute_alias(key)] = new_hash.delete(key)