[ruby/sinatra] Use CGI.escape_html (#10094)

CGI.escape_html seems more performant.

frameworks/Ruby/sinatra-sequel/views/fortunes.erb

@@ -6,7 +6,7 @@
 <% @fortunes.each do |fortune| %>
 <tr>
   <td><%= fortune.id %></td>
-  <td><%= Rack::Utils.escape_html(fortune.message) %></td>
+  <td><%= CGI.escape_html(fortune.message) %></td>
 </tr>
 <% end %>
 </table>

frameworks/Ruby/sinatra/views/fortunes.erb

@@ -6,7 +6,7 @@
 <% @fortunes.each do |fortune| %>
 <tr>
   <td><%= fortune.id %></td>
-  <td><%= Rack::Utils.escape_html(fortune.message) %></td>
+  <td><%= CGI.escape_html(fortune.message) %></td>
 </tr>
 <% end %>
 </table>