There are plenty of posts on the forum already about upgrading. Take a look at these, as well as the upgrade docs: Upgrading GitLab | GitLab
Make sure you follow the upgrade path. Do not attempt to jump to any specific version higher than what you should be upgrading too - unless you want to break your installation and then have to restore it.
You will still need to follow the upgrade path and not just pull the latest docker image. I don’t use docker, I prefer proper installations on servers as I feel they are far easier to manage therefore other than what I have suggested I cannot help anymore. Feel free to search the forum, I expect people have already posted about upgrading Gitlab when using docker.
Upgrading to sameersbn/gitlab:14.4.3 from sameersbn/gitlab:7.x.x can cause issues. It is therefore required that you first upgrade to sameersbn/gitlab:8.0.5-1 before upgrading to sameersbn/gitlab:8.1.0 or higher.
W.r.t the above note, my interpretation is the upgrade from v8.1.0 or higher could do direct upgrade to v14.4.3.
Is there any one try the similar approach and upgraded successfully?
Thanks.