Bump rubocop from 0.53.0 to 0.54.0 (#411)

Bumps [rubocop](https://github.com/bbatsov/rubocop) from 0.53.0 to 0.54.0.
- [Release notes](https://github.com/bbatsov/rubocop/releases)
- [Changelog](https://github.com/bbatsov/rubocop/blob/master/CHANGELOG.md)
- [Commits](rubocop/rubocop@v0.53.0...v0.54.0)

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

Gemfile

@@ -73,7 +73,7 @@ group :development do
   # version to be compatible with current OS versions.
   gem 'invoker'
   gem 'listen', '~> 3.1.5'
-  gem 'rubocop', '~> 0.53.0', require: false
+  gem 'rubocop', '~> 0.54.0', require: false
   # Spring speeds up development by keeping your application running in the
   # background. Read more: https://github.com/rails/spring
   gem 'spring'

Gemfile.lock

@@ -251,7 +251,7 @@ GEM
       orm_adapter (>= 0.4.0)
       sequel (>= 3.18.0)
     parallel (1.12.1)
-    parser (2.5.0.2)
+    parser (2.5.0.4)
       ast (~> 2.4.0)
     pg (1.0.0)
     powerpack (0.1.1)
@@ -332,7 +332,7 @@ GEM
       rspec-mocks (~> 3.7.0)
       rspec-support (~> 3.7.0)
     rspec-support (3.7.1)
-    rubocop (0.53.0)
+    rubocop (0.54.0)
       parallel (~> 1.10)
       parser (>= 2.5)
       powerpack (~> 0.1)
@@ -443,7 +443,7 @@ DEPENDENCIES
   recaptcha (~> 4.6.4)
   rspec (~> 3.7.0)
   rspec-rails (~> 3.7.2)
-  rubocop (~> 0.53.0)
+  rubocop (~> 0.54.0)
   sneakers (= 2.6.0)
   spring
   spring-watcher-listen (~> 2.0.0)