[rubygems/rubygems] Removed unused stringio
Fixed https://github.com/rubygems/rubygems/pull/7996
https://github.com/rubygems/rubygems/commit/16bfcac883
[rubygems/rubygems] Removed unused stringio
Fixed https://github.com/rubygems/rubygems/pull/7996
https://github.com/rubygems/rubygems/commit/16bfcac883