fix: Gemfile to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-RUBY-ACTIONPACK-8496389

Gemfile

@@ -5,7 +5,7 @@ ruby '2.7.8'
 
 # Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
 
-gem 'rails', '~> 7.1'
+gem 'rails', '~> 7.1', '>= 7.1.5.1'
 # Use sqlite3 as the database for Active Record
 gem 'sqlite3', '~> 1.4'
 # Use Puma as the app server