You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: dependency_change.rb
    path of file: ./repos/dependabot-core/updater/lib/dependabot
    
    the code of the file until where you have to start completion: # typed: strict
# frozen_string_literal: true

require "sorbet-runti
    
    def pr_message
      return @pr_message unless @pr_message.nil?

      case job.source.provider
      when "github"
        pr_message_max_length = Dependabot::PullRequestCreator::Github::PR_DESCRIPTION_MAX_LENGTH
      when "azure"
        pr_message_max_length = Dependabot::PullRequestCreator::Azure::PR_DESCRIPTION_MAX_LENGTH
        pr_message_encoding = Dependabot::PullRequestCreator::Azure::PR_DESCRIPTION_ENCODING
      when "codecommit"
        pr_message_max_length = Dependabot::PullRequestCreator::Codecommit::PR_DESCRIPTION_MAX_LENGTH
      when "bitbucket"
        pr_message_max_length = Dependabot::PullRequestCreator::Bitbucket::PR_DESCRIPTION_MAX_LENGTH
      else
        pr_message_max_length = Dependabot::PullRequestCreator::Github::PR_DESCRIPTION_MAX_LENGTH
      end