### Godot version

4.1.stable.flathub

### System information

Ubuntu 22

### Issue description

I'm converting my project and just caught the version 4.0 in _`"to work in Godot 4.0"`_ instead of current version. I'm not sure if it's intended but I feel like it would make more sense to have current version or just 4.x

![image](https://github.com/godotengine/godot/assets/14089949/03411389-c0c2-4527-8946-b1fdf348abe8)


### Steps to reproduce

Try converting a project to Godot 4 from Godot 3

### Minimal reproduction project

Default Godot 3 project opened with Godot 4
if (p_path.get_extension().to_lower() == "godot") {
		return singleton->icon_type_cache["GodotMonochrome"];
	}
	return singleton->icon_type_cache["Object"];
}
Ref<Texture2D> ProjectManager::_file_dialog_get_thumbnail(const String &p_path) {
	if (p_path.get_extension().to_lower() == "godot") {
		return singleton->icon_type_cache["GodotFile"];
	}
	return Ref<Texture2D>();
}
void ProjectManager::_build_icon_type_cache(Ref<Theme> p_theme) {
	if (p_theme.is_null()) {
		return;
	}
	List<StringName> tl;
	p_theme->get_icon_list(SNAME("EdorIcons"), &tl);
	for (List<StringName>::Element *E = tl.front(); E; E = E->next()) {
		icon_type_cache[E->get()] = p_theme->get_icon(E->get(), SNAME("EdorIcons"));
	}
}
void ProjectManager::_dim_window() {