[rubygems/rubygems] Fix missing required rubygems version when using old APIs

A while ago, we fixed resolution when using old dependency endpoints to
also consider metadata dependencies, by requesting the full gemspec from
the marsahaled index, which includes this information as opposed to
these old APIs. This has made resolution slower, but correct, but also
introduced the issue that some old marshaled gemspecs don't include the
`required_rubygems_version` field because they were created with a
RubyGems version that predates its addition.

Use a default value in this case.

https://github.com/rubygems/rubygems/commit/5dc94afcc0

Co-authored-by: Ilya Dudarenko <i.dudarenko@tinkoff.ru>

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