fix: Gemfile to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-RUBY-ACTIONMAILER-8220269
- https://snyk.io/vuln/SNYK-RUBY-ACTIONPACK-8220162
- https://snyk.io/vuln/SNYK-RUBY-ACTIONPACK-8220268
- https://snyk.io/vuln/SNYK-RUBY-ACTIONTEXT-8220270

Gemfile

@@ -7,7 +7,7 @@ gem 'pkg-config', '~> 1.4'
 gem 'rexml', '~> 3.2'
 
 gem 'puma', '~> 5.6'
-gem 'rails', '~> 6.1.7'
+gem 'rails', '~> 7.0.0'
 gem 'sprockets', '~> 3.7.2'
 gem 'thor', '~> 1.2'
 gem 'rack', '~> 2.2.4'
@@ -71,7 +71,7 @@ gem 'premailer-rails'
 gem 'rack-attack', '~> 6.6'
 gem 'rack-cors', '~> 1.1', require: 'rack/cors'
 gem 'rails-i18n', '~> 6.0'
-gem 'rails-settings-cached', '~> 0.6'
+gem 'rails-settings-cached', '~> 2.8', '>= 2.8.3'
 gem 'redcarpet', '~> 3.5'
 gem 'redis', '~> 4.5', require: ['redis', 'redis/connection/hiredis']
 gem 'mario-redis-lock', '~> 1.2', require: 'redis_lock'