troposphere 4.3.2 contains py.typed

Release 4.3.2 is missing in the commit history, therefore I don't know why it contains a `py.typed` file. But that's nothing a patch release should introduce. The type hints are also not good enough yet, I'd say.

Start by comparing the 4.3.2 package contents with the available commit history around that release, focusing on the unexpected py.typed file. No source file or test is named, so first establish how the release artifact was built and where that file entered it. Done means determining whether the inclusion was accidental and recording the appropriate release behavior.

Written by the indexing model from the issue text.