Remove upper version bound on highsbox

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: h-g-s

pyproject.toml

@@ -41,7 +41,7 @@ numpy = [
     "numpy>=1.25,<3",
 ]
 gurobi = ["gurobipy>=10"]
-highs = ["highsbox>=1.10.0,<2"]
+highs = ["highsbox>=1.10.0"]
 test = [
     "pytest>=7.4,<9",
     "networkx>=2.8.8,<4",