Gitlab update from version 13.x to 14.x

 # yum --enablerepo=epel update -y

* unicorn['worker_timeout'] has been deprecated since 13.10 and was removed in 14.0. Starting gitlab 14.0, unicorn is no longer supported and users must switch to Puma, following https://docs.gitlab.com/ee/administration/operations/puma.html

Solution
1. Edit the config file and change from unicorn to puma

# vi /etc/gitlab/gitlab.rb

2. and change the value from unicorn to puma

unicorn['worker_timeout'] to
puma['worker_timeout']

3. and run reconfigure command
# gitlab-ctl reconfigure


4. Again run the update command
# yum --enablerepo=epel update -y

You will be successful