### 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)

arg->tex_builtin = p_builtin;
				for (KeyValue<StringName, HashSet<int>> &E : arg->tex_argument_connect) {
					for (const int &F : E.value) {
						if (!_propagate_function_call_sampler_builtin_reference(E.key, F, p_builtin)) {
							return false;
						}
					}
				}
				return true;
			}
		}
	}
	ERR_FAIL_V(false); 
}
Error ShaderLanguage::_parse_array_size(BlockNode *p_block, const FunctionInfo &p_function_info, bool p_forbid_unknown_size, Node **r_size_expression, int *r_array_size, bool *r_unknown_size) {
	bool error = false;
	if (r_array_size != nullptr && *r_array_size > 0) {
		error = true;
	}
	if (r_unknown_size != nullptr && *r_unknown_size) {
		error = true;
	}
	if (error) {
		_set_error(vformat(RTR("Array size is already defined.")));
		return ERR_PARSE_ERROR;
	}
	TkPos pos = _get_tkpos();
	Token tk = _get_token();
	if (tk.type == TK_BRACKET_CLOSE) {
		if (p_forbid_unknown_size) {