build(deps-dev): bump rubocop-rails from 2.27.0 to 2.29.1

Bumps [rubocop-rails](https://github.com/rubocop/rubocop-rails) from 2.27.0 to 2.29.1.
- [Release notes](https://github.com/rubocop/rubocop-rails/releases)
- [Changelog](https://github.com/rubocop/rubocop-rails/blob/master/CHANGELOG.md)
- [Commits](rubocop/rubocop-rails@v2.27.0...v2.29.1)

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

Signed-off-by: dependabot[bot] <[email protected]>

Gemfile.lock

@@ -156,7 +156,7 @@ GEM
       regexp_parser (>= 1.5, < 3.0)
       xpath (~> 3.2)
     cgi (0.4.1)
-    concurrent-ruby (1.3.4)
+    concurrent-ruby (1.3.5)
     connection_pool (2.4.1)
     crack (1.0.0)
       bigdecimal
@@ -256,7 +256,7 @@ GEM
       domain_name (~> 0.5)
     http-form_data (2.3.0)
     httpclient (2.8.3)
-    i18n (1.14.6)
+    i18n (1.14.7)
       concurrent-ruby (~> 1.0)
     io-console (0.7.2)
     irb (1.13.2)
@@ -323,7 +323,7 @@ GEM
     mini_histogram (0.3.1)
     mini_mime (1.1.5)
     minitar (1.0.2)
-    minitest (5.25.1)
+    minitest (5.25.4)
     msgpack (1.7.2)
     multi_json (1.15.0)
     multi_xml (0.7.1)
@@ -479,7 +479,7 @@ GEM
     rubocop-performance (1.23.1)
       rubocop (>= 1.48.1, < 2.0)
       rubocop-ast (>= 1.31.1, < 2.0)
-    rubocop-rails (2.27.0)
+    rubocop-rails (2.29.1)
       activesupport (>= 4.2.0)
       rack (>= 1.1)
       rubocop (>= 1.52.0, < 2.0)