### 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
StringName struct_name;
				DataPrecision precision = PRECISION_DEFAULT;
				DataType type;
				StringName name;
				int array_size = 0;
				if (tk.type == TK_CONST) {
					is_constant = true;
					tk = _get_token();
				}
				if (is_token_precision(tk.type)) {
					precision = get_token_precision(tk.type);
					tk = _get_token();
				}
				if (shader->structs.has(tk.text)) {
					is_struct = true;
					struct_name = tk.text;
				} else {
#ifdef DEBUG_ENABLED
					if (_lookup_next(next)) {
						if (next.type == TK_UNIFORM) {
							keyword_completion_context = CF_UNIFORM_QUALIFIER;
						}
					}
#endif 
					if (!is_token_datatype(tk.type)) {
						_set_error(RTR("Expected constant, function, uniform or varying."));
						return ERR_PARSE_ERROR;
					}
					if (!is_token_variable_datatype(tk.type)) {
						if (is_constant) {