### Godot version

v4.1.dev.custom_build.a7276f1ce

### System information

Win10, AMD 2600, GeForce GTX 1060, Vulkan API 1.3.205

### Issue description

I can't get correct color data from an array of source_color type.
The color data is saved as **Color** in the file:
`shader_parameter/palette = [Color (1, 0, 0, 1), Color (0, 1, 0, 1), Color (0, 0, 1, 1)]`
Shouldn't it be saved as PackedColorArray?


### Steps to reproduce

1.Declare an array of source_color type.
2.Set colors.

### Minimal reproduction project

[shadertest.zip](https://github.com/godotengine/godot/files/11246504/shadertest.zip)

switch (p_interpolation) {
		case INTERPOLATION_FLAT:
			return "flat";
		case INTERPOLATION_SMOOTH:
			return "smooth";
		default:
			break;
	}
	return "";
}
String ShaderLanguage::get_datatype_name(DataType p_type) {
	switch (p_type) {
		case TYPE_VOID:
			return "void";
		case TYPE_BOOL:
			return "bool";
		case TYPE_BVEC2:
			return "bvec2";
		case TYPE_BVEC3:
			return "bvec3";
		case TYPE_BVEC4:
			return "bvec4";