Bump rubocop-rails from 2.23.1 to 2.24.0

Bumps [rubocop-rails](https://github.com/rubocop/rubocop-rails) from 2.23.1 to 2.24.0.
- [Release notes](https://github.com/rubocop/rubocop-rails/releases)
- [Changelog](https://github.com/rubocop/rubocop-rails/blob/master/CHANGELOG.md)
- [Commits](https://github.com/rubocop/rubocop-rails/compare/v2.23.1...v2.24.0)

---
updated-dependencies:
- dependency-name: rubocop-rails
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Gemfile.lock

@@ -235,8 +235,7 @@ GEM
     dotenv-rails (3.1.0)
       dotenv (= 3.1.0)
       railties (>= 6.1)
-    drb (2.2.0)
-      ruby2_keywords
+    drb (2.2.1)
     dumb_delegator (1.0.0)
     elasticsearch (7.0.0)
       elasticsearch-api (= 7.0.0)
@@ -581,11 +580,11 @@ GEM
       rubocop (~> 1.41)
     rubocop-factory_bot (2.25.1)
       rubocop (~> 1.41)
-    rubocop-rails (2.23.1)
+    rubocop-rails (2.24.0)
       activesupport (>= 4.2.0)
       rack (>= 1.1)
       rubocop (>= 1.33.0, < 2.0)
-      rubocop-ast (>= 1.30.0, < 2.0)
+      rubocop-ast (>= 1.31.1, < 2.0)
     rubocop-rspec (2.27.0)
       rubocop (~> 1.40)
       rubocop-capybara (~> 2.17)
@@ -594,7 +593,6 @@ GEM
     ruby-units (4.0.2)
     ruby-vips (2.2.0)
       ffi (~> 1.12)
-    ruby2_keywords (0.0.5)
     rubyzip (2.3.2)
     sass (3.7.4)
       sass-listen (~> 4.0.0)