⬆️ Bump rubocop-rails from 2.27.0 to 2.28.0 (#2936)

Author: dependabot[bot]

Gemfile.lock

@@ -471,7 +471,7 @@ GEM
       ffi (~> 1.0)
     rdoc (6.10.0)
       psych (>= 4.0.0)
-    regexp_parser (2.9.3)
+    regexp_parser (2.10.0)
     reline (0.6.0)
       io-console (~> 0.5)
     representable (3.2.0)
@@ -508,7 +508,7 @@ 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)