### Godot version

4.0.3

### System information

Win7

### Issue description

![image](https://github.com/godotengine/godot/assets/28286958/abec9d3c-e078-424c-9430-d9fe8897aad6)


### Steps to reproduce

1. Create shader
2. Add uint with hex, e.g. 0xffffu

### Minimal reproduction project

N/A
switch (p_node->type) {
		case Node::NODE_TYPE_OPERATOR: {
			const OperatorNode *op_node = static_cast<const OperatorNode *>(p_node);
			for (int i = int(op_node->op == OP_CALL); i < op_node->arguments.size(); i++) {
				if (!_check_node_constness(op_node->arguments[i])) {
					return false;
				}
			}
		} break;
		case Node::NODE_TYPE_CONSTANT:
			break;
		case Node::NODE_TYPE_VARIABLE: {
			const VariableNode *var_node = static_cast<const VariableNode *>(p_node);
			if (!var_node->is_const) {
				return false;
			}
		} break;
		case Node::NODE_TYPE_ARRAY: {
			const ArrayNode *arr_node = static_cast<const ArrayNode *>(p_node);
			if (!arr_node->is_const) {
				return false;
			}
		} break;
		default:
			return false;
	}
	return true;
}
bool ShaderLanguage::_validate_assign(Node *p_node, const FunctionInfo &p_function_info, String *r_message) {