Adjust how iters are added to extra_info on highs

Author: mrmundt

pyomo/contrib/solver/solvers/highs.py

@@ -752,13 +752,13 @@ def _postsolve(self, stream: io.StringIO):
                 results.objective_bound = info.mip_dual_bound
 
             if info.valid:
-                results.extra_info.iteration_counts = {
-                    'simplex_iteration_count': info.simplex_iteration_count,
-                    'ipm_iteration_count': info.ipm_iteration_count,
-                    'mip_node_count': info.mip_node_count,
-                    'pdlp_iteration_count': info.pdlp_iteration_count,
-                    'qp_iteration_count': info.qp_iteration_count,
-                }
+                results.extra_info.simplex_iteration_count = (
+                    info.simplex_iteration_count
+                )
+                results.extra_info.ipm_iteration_count = info.ipm_iteration_count
+                results.extra_info.mip_node_count = info.mip_node_count
+                results.extra_info.pdlp_iteration_count = info.pdlp_iteration_count
+                results.extra_info.qp_iteration_count = info.qp_iteration_count
 
         if config.load_solutions:
             if has_feasible_solution: