Update topgrade to 16.6.0

https://github.com/topgrade-rs/topgrade/releases/tag/v16.6.0

Author: github-actions[bot]

specs/topgrade.spec

@@ -1,7 +1,7 @@
 %global debug_package %{nil}
 
 Name:    topgrade
-Version: 16.5.0
+Version: 16.6.0
 Release: 1%{?dist}
 Summary: Upgrade all the things