[C#] Image.CompressMode lacks Astc

[ChloePrime]

Godot version

Godot_v4.0.2-stable_mono_win64

System information

Windows 11 22H2

Issue description

enum CompressMode in C# glue lacks the Astc option

Steps to reproduce

1. Download godot mono version.
2. use some IDE to see the C# glue source code, search CompressMode and jump to that class.
3. see the lackage of Astc option.

Minimal reproduction project

N/A

Workaround

use Image.CompressMode.Bptc + 1 instead of the non-existing Image.CompressMode.Astc

[AThousandShips]

That's because the constant isn't bound in ClassDB for some reason, so it's not exposed to GDScript either, will see about a fix, is easy and assuming it's just an oversight