Reverse dependencies for xdr

Latest version of the following gems require xdr

Gem	Version	Date	Downloads
stellar-base +514 Thousand Downloads	`0.32.0` May 17, 2022	May 17, 2022	514 Thousand
auction-ruby-base +9.84 Thousand Downloads	`0.1.3` January 28, 2016	January 28, 2016	9.84 Thousand
digitalbits-base +4.5 Thousand Downloads	`0.27.2` August 03, 2021	August 03, 2021	4.5 Thousand
open-core +3.6 Thousand Downloads	`0.3.0` September 09, 2015	September 09, 2015	3.6 Thousand