[Maintainer update] graphics/decker bump from 1.46 to 1.47

New release with new fixes, features, and examples.

https://internet-janitor.itch.io/decker/devlog/771436/decker-147

Works on amd64. A fun example to try is:

decker /usr/local/share/examples/decker/loveletter.deck

OK?

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