### 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)

if (error != OK) {
							return error;
						}
						tk = _get_token();
					}
					shader->varyings[name] = varying;
#ifdef DEBUG_ENABLED
					if (check_warnings && HAS_WARNING(ShaderWarning::UNUSED_VARYING_FLAG)) {
						used_varyings.insert(name, Usage(tk_line));
					}
#endif 
				}
			} break;
			case TK_UNIFORM_GROUP: {
				tk = _get_token();
				if (tk.type == TK_IDENTIFIER) {
					current_uniform_group_name = tk.text;
					tk = _get_token();
					if (tk.type == TK_PERIOD) {
						tk = _get_token();
						if (tk.type == TK_IDENTIFIER) {
							current_uniform_subgroup_name = tk.text;
							tk = _get_token();
							if (tk.type != TK_SEMICOLON) {
								_set_expected_error(";");
								return ERR_PARSE_ERROR;
							}
						} else {
							_set_error(RTR("Expected an uniform subgroup identifier."));
							return ERR_PARSE_ERROR;