The upgrade selection would only upgrade you to the last version of 4.2 if that is even out there for it to download.
4.2 has been end of life for a long time now.
You need to upgrade the engine itself to at least 4.3.10 to upgrade to 4.4,.
So much has changed internally with 4.2 to 4.3 to 4.4, (4.4 is based on CentOS8, etc.) that a simple yum
update won't do it. For that big of a jump you might want to save off the VM images somewhere external
and redeploy as a new 4.4 cluster and import the images into the new cluster.