update CITATION file

Author: lkdvos

CITATION.cff

@@ -8,7 +8,7 @@ authors:
   given-names: "Jutho"
   orcid: "https://orcid.org/0000-0002-0858-291X"
 title: "TensorKit.jl"
-version: "0.15.0"
+version: "0.16.0"
 doi: "10.5281/zenodo.8421339"
 date-released: "2025-10-03"
 url: "https://github.com/QuantumKitHub/TensorKit.jl"