Update dependency rubocop-rspec to '~> 3.8.0'

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
rubocop-rspec (changelog)	'~> 3.7.0' -> '~> 3.8.0'

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Release Notes

rubocop/rubocop-rspec (rubocop-rspec)

v3.8.0

Compare Source

• Add new cop RSpec/LeakyLocalVariable. ([@​lovro-bikic])
• Bump RuboCop requirement to +1.81. ([@​ydah])
• Fix a false positive for RSpec/LetSetup when let! used in outer scope. ([@​ydah])
• Fix a false positive for RSpec/ReceiveNever cop when allow(...).to receive(...).never. ([@​ydah])
• Fix detection of nameless doubles with methods in RSpec/VerifiedDoubles. ([@​ushi-as])
• Improve an offense message for RSpec/RepeatedExample cop. ([@​ydah])
• Let RSpec/SpecFilePathFormat leverage ActiveSupport inflections when configured. ([@​corsonknowles], [@​bquorning])

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