Extension update: Sprite3D - Add transparency support

[github-actions]

Changes

This add transparency support on Sprite3D against ShapePainter.

Before/After

How to use the new features

No response

Checklist

• I've followed all of the best practices.
• I confirm that this extension can be integrated to this GitHub repository, distributed and MIT licensed.
• I am aware that the extension may be updated by anyone, and do not need my explicit consent to do so.

Example file

gdevelop-game.zip

Extension file

Sprite3D.zip

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Extension by @Bouh

You can update the extension on this "Pull Request" by commenting the update command: in the comment field, type !update, then drag and drop a zip file with your extension file in the commenting field, like how you initially submitted the extension. It should look like this:

!update [MyExtension.zip](https://github.com/GDevelopApp/GDevelop-extensions/files/12709661/MyExtension.zip)

It can take a few seconds for the file to fully upload and show as the above. Once it is like shown above, click "Comment" and let the bot do the rest!

[D8H]

Thank you for submitting an extension update.

This is a duplicate of:

• Extension update: Sprite3D #2020

From what I understand, it rounds the alpha channel to either 0 or 1 which doesn't sound like an ideal solution.
Also, it's not safe to modify the material directly because the material may be shared with other objects.