fix: Gemfile to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-RUBY-REXML-7577227
- https://snyk.io/vuln/SNYK-RUBY-REXML-7577228

Gemfile

@@ -38,7 +38,7 @@ group :development, :test do
  gem 'rspec-rails'
  gem 'rspec-rerun'
  # Required during CI as well local development
- gem 'rubocop'
+ gem 'rubocop', '>= 1.57.0'
 end
 
 group :test do