[Security] Bump brakeman from 4.6.1 to 4.7.1 (#12329)

Bumps [brakeman](https://github.com/presidentbeef/brakeman) from 4.6.1 to 4.7.1. **This update includes a security fix.**
- [Release notes](https://github.com/presidentbeef/brakeman/releases)
- [Changelog](https://github.com/presidentbeef/brakeman/blob/master/CHANGES.md)
- [Commits](https://github.com/presidentbeef/brakeman/compare/v4.6.1...v4.7.1)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Gemfile

@@ -136,7 +136,7 @@ group :development do
   gem 'memory_profiler'
   gem 'rubocop', '~> 0.75', require: false
   gem 'rubocop-rails', '~> 2.3', require: false
-  gem 'brakeman', '~> 4.6', require: false
+  gem 'brakeman', '~> 4.7', require: false
   gem 'bundler-audit', '~> 0.6', require: false
 
   gem 'capistrano', '~> 3.11'