rspec should be a dependency since rswag-specs requires rspec/core

[samsonnguyen]

rspec-specs does not list rspec as a dependency even though it is required by rswag/specs.rb

https://github.com/rswag/rswag/blob/master/rswag-specs/rswag-specs.gemspec

Expected:
rspec is listed as a dependency of rswag-specs

[stale]

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