I don't because it wouldn't have even made sense. I mean...first of all, they would not have known about the uniform change until after they made contact with Starfleet. I suppose after that, if they were going to change uniforms they would have to replicate hundreds of new ones and in theory they were supposed to be conserving energy.
IIRC, Starfleet uniforms are cleaned by throwing them into the replicator for recycling, so it shouldn't take any more energy just to change the replicator pattern to put out DS9-style uniforms rather than the old ones. Although Voyager's replicator rationing may have forced the crew to change how they cleaned up.
But I always assumed the reason why Voyager's crew didn't switch was "really" out-of-universe: the showrunners wanted each show to have a unique look.
But they were wearing the DSN style uniform, don't you mean the First Contact uniform?
Oh yeah, my bad.

As for 'updating' the unis: I disagree. The way I see it, the crew stuck to their existing ones as a link to home. Changing how they dressed would be drifting away from it. And it would have been a subtle cue that they didn't expect to GET home anytime soon, i.e. "Starfleet will never see us again so why should we dress like it?"
Conversely, the fact that they intentionally kept their unis unaltered would serve to remind them that they WOULD get home, and when they did, they could all resume their Starfleet careers.