fix: Gemfile & Gemfile.lock to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-RUBY-NOKOGIRI-8732769
- https://snyk.io/vuln/SNYK-RUBY-NOKOGIRI-8732779

Author: snyk-bot

Gemfile

@@ -4,7 +4,7 @@ git_source(:github) { |repo| "https://github.com/#{repo}.git" }
 ruby '~> 3.0'
 
 # Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
-gem 'rails', '~> 6.1'
+gem 'rails', '~> 7.0', '>= 7.0.0'
 # Use Puma as the app server
 gem 'puma', '~> 5.0'
 # Transpile app-like JavaScript. Read more: https://github.com/rails/webpacker
@@ -50,4 +50,4 @@ end
 # Windows does not include zoneinfo files, so bundle the tzinfo-data gem
 gem 'tzinfo-data', platforms: [:mingw, :mswin, :x64_mingw, :jruby]
 gem "twilio-ruby", "~> 5.46"
-gem "bootstrap", "~> 4.5"
+gem "bootstrap", "~> 4.6", ">= 4.6.2.1"