Update sidekiq supervisord config; sidekiq v6.0

Sidekiq is updated to v6.0 here (first contained tag: v14.4.0-ee)
https://gitlab.com/gitlab-org/gitlab/-/merge_requests/69655

In Sidekiq 6.0, these options have been marked as "deprecated":
-P (set pid file)
-L (set log file)
See sidekiq/sidekiq@3f5b1c5

Now, we can see error message in {GITLAB_LOGS_DIR}/supervisor/sidekiq.log
like below:

----
ERROR: PID file creation was removed in Sidekiq 6.0, please use a proper process supervisor to start and manage your services
ERROR: Logfile redirection was removed in Sidekiq 6.0, Sidekiq will only log to STDOUT
----

Just stop using this option.

Author: kkimurak

assets/build/install.sh

@@ -353,8 +353,6 @@ command=bundle exec sidekiq -c {{SIDEKIQ_CONCURRENCY}}
   -C ${GITLAB_INSTALL_DIR}/config/sidekiq_queues.yml
   -e ${RAILS_ENV}
   -t {{SIDEKIQ_SHUTDOWN_TIMEOUT}}
-  -P ${GITLAB_INSTALL_DIR}/tmp/pids/sidekiq.pid
-  -L ${GITLAB_INSTALL_DIR}/log/sidekiq.log
 user=git
 autostart=true
 autorestart=true