Allow .gdshader files in 3to4 conversion

[tbxMb]

I added a check for ".gdshader" files in this line, as proposed by @qarmin in #69597

godot/editor/project_converter_3_to_4.cpp

Line 2391 in 44c0bfc

if (file_name.ends_with(".gd") || file_name.ends_with(".shader") || file_name.ends_with(".tscn") || file_name.ends_with(".tres") || file_name.ends_with(".godot") || file_name.ends_with(".cs") || file_name.ends_with(".csproj"))

Bugsquad edit: This closes #69597.

[akien-mga]

Needs a rebase to fix a temporary CI issue.

[tbxMb]

Is there anything i need to do or is this just waiting to be merged ?

[akien-mga]

See my previous comment. The CI didn't pass, and it needs to be rebased.
If you're not familiar with rebasing PRs, I can do it.

Edit: I pushed a rebase myself eventually.

[akien-mga]

Thanks! And congrats for your first merged Godot contribution 🎉