improve regrex for match(sidekiq) robustness

e.g.: the sidekiq in my Debian box is v2.11.1

lib/tasks/gitlab/check.rake

@@ -588,7 +588,7 @@ namespace :gitlab do
    def check_sidekiq_running
      print "Running? ... "

      if run_and_match("ps aux | grep -i sidekiq", /sidekiq \d\.\d\.\d.+$/)
      if run_and_match("ps aux | grep -i sidekiq", /sidekiq \d+\.\d+\.\d+.+$/)
        puts "yes".green
      else
        puts "no".red