### 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 (!is_uniform && interpolation != INTERPOLATION_DEFAULT && type < TYPE_INT) {
					_set_error(vformat(RTR("Interpolation modifier '%s' cannot be used with boolean types."), get_interpolation_name(interpolation)));
					return ERR_PARSE_ERROR;
				}
				if (!is_uniform && type > TYPE_MAT4) {
					_set_error(RTR("Invalid data type for varying."));
					return ERR_PARSE_ERROR;
				}
#ifdef DEBUG_ENABLED
				keyword_completion_context = CF_UNSPECIFIED;
#endif 
				tk = _get_token();
				if (tk.type != TK_IDENTIFIER && tk.type != TK_BRACKET_OPEN) {
					_set_error(RTR("Expected an identifier or '['."));
					return ERR_PARSE_ERROR;
				}
				if (tk.type == TK_BRACKET_OPEN) {
					Error error = _parse_array_size(nullptr, constants, true, nullptr, &array_size, nullptr);
					if (error != OK) {
						return error;
					}
					tk = _get_token();
				}
				if (tk.type != TK_IDENTIFIER) {
					_set_error(RTR("Expected an identifier."));
					return ERR_PARSE_ERROR;
				}
				prev_pos = _get_tkpos();
				name = tk.text;