--------------------
This release fixes a bug where using a custom scalar in a union would result
in an unclear exception. Instead, when using a custom scalar in a union,
the `InvalidUnionType` exception is raised with a clear message that you
cannot use that type in a union.
Contributed by [Jonathan Kim](https://github.com/jkimbo) via [PR #2336](https://github.com/strawberry-graphql/strawberry/pull/2336/)