Update dependency rubocop-rspec to '~> 3.9.0'

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
rubocop-rspec (changelog)	'~> 3.8.0' → '~> 3.9.0'

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Release Notes

rubocop/rubocop-rspec (rubocop-rspec)

v3.9.0

Compare Source

• Fix a false positive for RSpec/LeakyLocalVariable when variables are used only in example metadata (e.g., skip messages). ([@​ydah])
• Fix a false positive for RSpec/ScatteredSetup when the hook is defined inside a class method. ([@​d4rky-pl])
• Fix a false positive for RSpec/DescribedClass inside dynamically evaluated blocks (class_eval, module_eval, instance_eval, class_exec, module_exec, instance_exec). ([@​sucicfilip])
• Add new cop RSpec/Output. ([@​kevinrobell-st])

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