fix: Gemfile to reduce vulnerabilities (heroku#118)

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-RUBY-RACK-3356639

Co-authored-by: snyk-bot <snyk-bot@snyk.io>

Author: svc-ast-gh-snyk3

Gemfile

@@ -2,7 +2,7 @@ source 'https://rubygems.org'
 ruby '>= 3.1', '< 3.3'
 
 # Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
-gem 'rails', '~> 7.0.4.2 '
+gem 'rails', '~> 7.0.4.2'
 # Use postgresql as the database for Active Record
 gem 'pg', '~> 1.3.5'
 # Use SCSS for stylesheets