[rubygems/rubygems] fix Gem::Dependency#to_spec returning nil when prerelease is the only available version
https://github.com/rubygems/rubygems/commit/a7dcc7214b
[rubygems/rubygems] fix Gem::Dependency#to_spec returning nil when prerelease is the only available version
https://github.com/rubygems/rubygems/commit/a7dcc7214b