For one thing, ITensorUnicodePlots v0.1.2 still has UnicodePlots = "2.5.0" in its [compat] section. I would assume your version (v0.1.1) is what is keeping you at v2.12.4 for UnicodePlots. There may well be other packages in your environment that also has direct or indirect dependencies on UnicodePlots that hold back the update.
I won’t preach you about having this many packages in the main environment (I often find myself in the same situation and then “spring clean” a little), but this is what happens when you do…