Vacuum table for Papertrail Versions

[Quentinchampenois]

Describe the bug
A clear and concise description of what the bug is.

Versions table is never cleaned up, add a VACUUM on the cleanup task

Example

In app/jobs/decidim/papertrail_versions_job.rb

    def perform(ret = nil)
    .....
      vacuum_table! if total.positive?

      log! "#{total} versions removed"
      
      end
      
      private
      
      def vacuum_table!
      log! "Running VACUUM on table 'versions'"
      sql = "VACUUM (FULL) versions;"
      ActiveRecord::Base.connection.execute(sql)
    end