The current libSoQt20 version in the Packman repo is 1.5.0-5.25 , so apparently your repo metadata cache is outdated.
Run “zypper ref” to refresh it.
And check that you have enabled Auto-Refresh for the Packman repo(s) in YaST->Software Repositories.
It could of course also have happened that the package got updated after your repos got refreshed and before you installed the updates.
In that case just try again and it should work.