Update packages in pubspec.yaml

[deinspanjer]

I've gone through the pubspec files in edgehead and egamebook_builder and updated everything to the latest versions.

Initial quick tests seem to indicate everything works fine so far.

If I verify that all the tests do in fact succeed, would you like a pull request for this change?

I'm guessing the big unknown is whether any of the flutter / mobile portions have trouble since I can't see any of that.