If the SQL Server versions and the Windows versions are both fully supported according to the PAM (Product Availability Matrix) for version 10.5, then ok, you're good to go. If not, then not and you have to check in which order you may perform those two upgrades in order to not get into severe trouble.
Nonetheless performing in-place upgrades of the software is always risky. We've discussed this item numerous times, so I won't repeat here all the details which may go wrong.
If at all possible, perform a parallel installation of 10.5 and migrate the installations from 10.4.1 on the old servers to 10.5 on the new servers. This is far less sensible to errors, break-downs, and any kind of accidents and mistakes. Honestly I can only advice against in-place upgrades.
Informatica 10.4.1 is supported with both Windows 2012 and Windows 2019 operating systems as well as MS SQL Server 2014 and 2019. So you can upgrade your server OS and Repository database.
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Both the inplace and parallel upgrade can be performed. But it is always safe to proceed with the parallel upgrade.
As said by Manmohan "Informatica 10.4.1 is supported with both Windows 2012 and Windows 2019 operating systems as well as MS SQL Server 2014 and 2019. So you can upgrade your server OS and Repository database."
Please make sure to take a backup of Domain and Services configured before performing any operation.