Removed Bundler Audit

Necessary due to a
[bug](rubysec/bundler-audit#302) with Bundler
Audit and Psych 4.0.0. This is meant as a temporary removal but might
turn into a permanent removal if no good alternative can be found since
this is breaking builds and local development entirely.

Gemfile

@@ -5,7 +5,6 @@ source "https://rubygems.org"
 gemspec
 
 group :code_quality do
-  gem "bundler-audit", "~> 0.7"
   gem "bundler-leak", "~> 0.2"
   gem "git-lint", "~> 2.0"
   gem "reek", "~> 6.0"

Rakefile

@@ -1,7 +1,6 @@
 # frozen_string_literal: true
 
 require "bundler/setup"
-require "bundler/audit/task"
 require "bundler/plumber/task"
 require "gemsmith/rake/setup"
 require "git/lint/rake/setup"
@@ -10,14 +9,13 @@ require "rspec/core/rake_task"
 require "rubocop/rake_task"
 require "rubycritic/rake_task"
 
-Bundler::Audit::Task.new
 Bundler::Plumber::Task.new
 Reek::Rake::Task.new
 RSpec::Core::RakeTask.new :spec
 RuboCop::RakeTask.new
 RubyCritic::RakeTask.new
 
 desc "Run code quality checks"
-task code_quality: %i[bundle:audit bundle:leak git_lint reek rubocop rubycritic]
+task code_quality: %i[bundle:leak git_lint reek rubocop rubycritic]
 
 task default: %i[code_quality spec]