I believe the game was originally built for consoles, so the PC version is a port. A port of a last gen console game.
Maybe it is possible to force 4k I wouldn't know
You probably have to mess around with files or whatever.
But there isn't an official release or patch to improve the game to current gen standards.
Some of the dialogue has changed now anyway, ok so not much and it's only related to questioning. I remember reading that originally the relevant dialogue was intended to be different than what it was in the first release.