dep-dev: bump rubocop-rspec from 2.8.0 to 2.9.0

Bumps rubocop-rspec from 2.8.0 to 2.9.0.

Release notes

Sourced from rubocop-rspec's releases.

RuboCop RSpec v2.9.0

• Add new RSpec/BeNil cop. (@​bquorning)
• Add new RSpec/BeEq cop. (@​bquorning)

Changelog

Sourced from rubocop-rspec's changelog.

2.9.0 (2022-02-28)

• Add new RSpec/BeNil cop. ([@​bquorning][])
• Add new RSpec/BeEq cop. ([@​bquorning][])

Commits

• a4d2e52 Merge pull request #1242 from rubocop/release
• 68191c5 Bump version to 2.9.0
• d8a44b9 Merge pull request #1243 from koic/fix_a_typo
• 5d34640 Fix a typo for RSpec/BeNil cop
• d3c350c Merge pull request #1240 from rubocop/simplify-be-eql-pattern
• 0b37208 Merge pull request #1238 from rubocop/add-be-eq-cop
• 1543554 Add new RSpec/BeEq cop
• 890a6c6 Simplify pattern in RSpec/BeEql
• 0a1a7b9 Merge pull request #1239 from rubocop/add-be-nil-cop
• d636fc7 Add new RSpec/BeNil cop
• Additional commits viewable in compare view

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