Add release note on timestamptz scaffolding change

2.1 scaffolds to DateTime and not to DateTimeOffset as before.

doc/release-notes/2.1.md

@@ -75,6 +75,7 @@ Here's the [full list of issues](https://github.com/npgsql/Npgsql.EntityFramewor
 > [!CAUTION]
 > The provider's classes have been moved from the namespace `Microsoft.EntityFrameworkCore` to `Npgsql.EntityFrameworkCore.PostgreSQL`. As a result, any migrations already generated in your project (as well as the mode snapshot) will have to be manually updated to use the new namespace. You will need to add `using Npgsql.EntityFrameworkCore.PostgreSQL.Metadata` to all the relevant files.
 
+* Columns of type `timestamp with time zone` will now be scaffolded as `DateTime` properties, and nt `DateTimeOffset` properties. The general use of `timestamp with time zone` is discouraged (this type does *not* store the timezone in the database), consider using regular `timestamp` instead.
 * If you're specifying index methods with `ForNpgsqlHasMethod()`, then you will have to fix migrations which generate those indices. In these migrations, you will find code such as `.Annotation("Npgsql:Npgsql:IndexMethod", "gin")`. You must remove the extra `Npgsql:`, leaving `.Annotation("Npgsql:IndexMethod", "gin")`.
 * Specifying versions when specifying PostgreSQL extensions on your model is no longer supported - this was a very rarely-used feature which interfered with extension scaffolding.
 * If you're still referencing the nuget package Npgsql.EntityFrameworkCore.PostgreSQL.Design, please remove it - it's no longer needed or up to date.