Update dependency rubocop-rspec to v2.30.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
rubocop-rspec (changelog)	'2.29.2' -> '2.30.0'

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Release Notes

rubocop/rubocop-rspec (rubocop-rspec)

v2.30.0: RuboCop RSpec v2.30.0

Compare Source

• Add new RSpec/ExpectInLet cop. (@​yasu551)

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[yegor256]

@rultor please, try to merge, since 6 checks have passed

[rultor]

@rultor please, try to merge, since 6 checks have passed

@yegor256 OK, I'll try to merge now. You can check the progress of the merge here

[rultor]

@rultor please, try to merge, since 6 checks have passed

@yegor256 Done! FYI, the full log is here (took me 7min)