gemspec: Allow Countries gem 6.x

[olleolleolle]

Countries, the gem, has released a 6.0.1 release, and we should allow that.

We added the version pin to "< 6" the last time this was updated.
56588d4

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@stcheng has imported this pull request. If you are a Meta employee, you can view this diff on Phabricator.

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@stcheng merged this pull request in 0d359ad.