Bump rubocop-rails from 2.27.0 to 2.28.0

Bumps [rubocop-rails](https://github.com/rubocop/rubocop-rails) from 2.27.0 to 2.28.0.
- [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...v2.28.0)

---
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

@@ -261,7 +261,7 @@ GEM
     rubocop-performance (1.23.0)
       rubocop (>= 1.48.1, < 2.0)
       rubocop-ast (>= 1.31.1, < 2.0)
-    rubocop-rails (2.27.0)
+    rubocop-rails (2.28.0)
       activesupport (>= 4.2.0)
       rack (>= 1.1)
       rubocop (>= 1.52.0, < 2.0)
@@ -460,7 +460,7 @@ CHECKSUMS
   rubocop-ast (1.37.0) sha256=9513ac88aaf113d04b52912533ffe46475de1362d4aa41141b51b2455827c080
   rubocop-disable_syntax (0.1.1) sha256=fba0b24edbd3de049ccaac8473c18fed308b5bd991e389a3368965f6cb88edbb
   rubocop-performance (1.23.0) sha256=34ae78cb1bc5f1a0b34a34a1f9f6eec2cb8b8b9cafa2ce37982021e86fa49171
-  rubocop-rails (2.27.0) sha256=c3a6cef509539cdefe5043992ab3530610b1fecc3d67befe3ff0215b96f2f4fe
+  rubocop-rails (2.28.0) sha256=4967bed9ea13e6dcab566fea4265a6dd0381db739b305e48930aba1282da2715
   rubocop-rspec (3.3.0) sha256=79e1b281a689044d1516fefbc52e2e6c06cd367c25ebeaf06a7a198e9071cd7d
   rubocop-rspec_rails (2.30.0) sha256=888112e83f9d7ef7ad2397e9d69a0b9614a4bae24f072c399804a180f80c4c46
   ruby-pg-extras (5.4.5) sha256=fd3f782d00cd9758c84e7543a355f5aa39964094ca32178e91f6ace6108e9a43