Merge branch '361271-replace-MD5-with-SHA256-in-insights' into 'master'

Remove require of MD5

See merge request gitlab-org/gitlab!88273

app/helpers/application_helper.rb

 # frozen_string_literal: true
-require 'digest/md5'
 require 'uri'
 module ApplicationHelper

app/models/key.rb

 # frozen_string_literal: true
-require 'digest/md5'
-
 class Key < ApplicationRecord
   include AfterCommitQueue
   include Sortable

config/settings.rb

 # frozen_string_literal: true
 require 'settingslogic'
-require 'digest/md5'
 class Settings < Settingslogic
   source ENV.fetch('GITLAB_CONFIG') { Pathname.new(File.expand_path('..', __dir__)).join('config/gitlab.yml') }

danger/roulette/Dangerfile

 # frozen_string_literal: true
-require 'digest/md5'
-
 REVIEW_ROULETTE_SECTION = <<MARKDOWN
 ## Reviewer roulette
 MARKDOWN

db/fixtures/development/04_labels.rb

 # frozen_string_literal: true
-require 'digest/md5'
-
 class Gitlab::Seeder::GroupLabels
   def initialize(group, label_per_group: 10)
     @group = group

ee/lib/gitlab/insights/serializers/chartjs/base_serializer.rb

 # frozen_string_literal: true
-require 'digest/md5'
-
 module Gitlab
   module Insights
     module Serializers