As a short answer: Yes, SQL Server 2019 is supported in Project Server 2019 / SharePoint 2019.
As we know, Project Server 2019 runs as a service application in SharePoint Server 2019 Enterprise Edition, so you just need to make sure that the SQL Server is supported for SharePoint 2019 as below:
Note: All future public updates and Service Pack for the above SQL Version are supported.
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