Bump rubocop-rspec from 2.18.0 to 2.18.1 (mastodon#23203)

Bumps [rubocop-rspec](https://github.com/rubocop/rubocop-rspec) from 2.18.0 to 2.18.1.
- [Release notes](https://github.com/rubocop/rubocop-rspec/releases)
- [Changelog](https://github.com/rubocop/rubocop-rspec/blob/master/CHANGELOG.md)
- [Commits](rubocop/rubocop-rspec@v2.18.0...v2.18.1)

---
updated-dependencies:
- dependency-name: rubocop-rspec
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Gemfile.lock

@@ -558,7 +558,7 @@ GEM
       redis (>= 4)
     redlock (1.3.2)
       redis (>= 3.0.0, < 6.0)
-    regexp_parser (2.6.1)
+    regexp_parser (2.6.2)
     request_store (1.5.1)
       rack (>= 1.4)
     responders (3.0.1)
@@ -614,9 +614,9 @@ GEM
       activesupport (>= 4.2.0)
       rack (>= 1.1)
       rubocop (>= 1.33.0, < 2.0)
-    rubocop-rspec (2.18.0)
+    rubocop-rspec (2.18.1)
       rubocop (~> 1.33)
-      rubocop-capybara
+      rubocop-capybara (~> 2.17)
     ruby-progressbar (1.11.0)
     ruby-saml (1.13.0)
       nokogiri (>= 1.10.5)